JP6884917B2 - Vehicle LED lighting control circuit, vehicle LED lighting control device, and vehicle LED lighting control circuit control method - Google Patents

Vehicle LED lighting control circuit, vehicle LED lighting control device, and vehicle LED lighting control circuit control method Download PDF

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JP6884917B2
JP6884917B2 JP2020501939A JP2020501939A JP6884917B2 JP 6884917 B2 JP6884917 B2 JP 6884917B2 JP 2020501939 A JP2020501939 A JP 2020501939A JP 2020501939 A JP2020501939 A JP 2020501939A JP 6884917 B2 JP6884917 B2 JP 6884917B2
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JPWO2019163074A1 (en
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豊隆 ▲高▼嶋
豊隆 ▲高▼嶋
智恭 上村
智恭 上村
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Shindengen Electric Manufacturing Co Ltd
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
    • B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q11/00—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
    • B62J6/00—Arrangement of optical signalling or lighting devices on cycles; Mounting or supporting thereof; Circuits therefor
    • B62J6/01—Electric circuits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
    • B62J6/00—Arrangement of optical signalling or lighting devices on cycles; Mounting or supporting thereof; Circuits therefor
    • B62J6/16—Arrangement of switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/395—Linear regulators
    • H05B45/397—Current mirror circuits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
    • B62J6/00—Arrangement of optical signalling or lighting devices on cycles; Mounting or supporting thereof; Circuits therefor
    • B62J6/02—Headlights
    • B62J6/022—Headlights specially adapted for motorcycles or the like
    • B62J6/024—Switching between high and low beam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
    • B62J6/00—Arrangement of optical signalling or lighting devices on cycles; Mounting or supporting thereof; Circuits therefor
    • B62J6/04—Rear lights
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
    • B62J6/00—Arrangement of optical signalling or lighting devices on cycles; Mounting or supporting thereof; Circuits therefor
    • B62J6/05—Direction indicators
    • B62J6/055—Electrical means, e.g. lamps
    • B62J6/056—Electrical means, e.g. lamps characterised by control means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Arrangements Of Lighting Devices For Vehicle Interiors, Mounting And Supporting Thereof, Circuits Therefore (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Description

本発明は、車両用ＬＥＤ点灯制御回路、車両用ＬＥＤ点灯制御装置、及び、車両用ＬＥＤ点灯制御回路の制御方法に関する発明である。 The present invention relates to a vehicle LED lighting control circuit, a vehicle LED lighting control device, and a control method for a vehicle LED lighting control circuit.

従来、定電圧制御された電圧によりＬＥＤランプの制御を行う車両用ＬＥＤ点灯制御回路が知られている（例えば、ＷＯ２０１４／１８４８４７参照）。 Conventionally, an LED lighting control circuit for a vehicle that controls an LED lamp by a constant voltage controlled voltage is known (see, for example, WO2014 / 184847).

このような従来のＬＥＤ点灯制御回路では、直列に接続されたＬＥＤ素子のうち、点灯させるＬＥＤ素子の段数が切り替えられても、これらのＬＥＤ素子に直列に接続されている抵抗の値は変化しない。 In such a conventional LED lighting control circuit, the value of the resistance connected in series to these LED elements does not change even if the number of stages of the LED elements to be lit is switched among the LED elements connected in series. ..

このため、当該車両用ＬＥＤ点灯制御回路に供給される電圧が定電圧制御されていることから、直列に接続されたＬＥＤ素子のうち、点灯させるＬＥＤ素子の段数が切り替えられると、点灯しているＬＥＤ素子に流れるＬＥＤ電流がばらつく（大きく変化する）こととなる。 Therefore, since the voltage supplied to the LED lighting control circuit for the vehicle is controlled by a constant voltage, the LED elements connected in series are lit when the number of stages of the LED elements to be lit is switched. The LED current flowing through the LED element will vary (change significantly).

このように、従来のＬＥＤ点灯制御回路では、定電圧制御された電圧が供給されている場合に、直列に接続されたＬＥＤ素子のうち点灯させるＬＥＤ素子の段数を変化させると、ＬＥＤ電流が安定しない問題がある。 In this way, in the conventional LED lighting control circuit, when a constant voltage controlled voltage is supplied, the LED current becomes stable when the number of stages of the LED elements to be lit among the LED elements connected in series is changed. There is a problem that does not occur.

そこで、本発明は、定電圧制御された電圧が供給されている場合に、直列に接続されたＬＥＤ素子のうち点灯させるＬＥＤ素子の段数を変化させても、ＬＥＤ電流を安定化させることが可能な車両用ＬＥＤ点灯制御回路を提供することを目的とする。 Therefore, according to the present invention, when a constant voltage controlled voltage is supplied, it is possible to stabilize the LED current even if the number of stages of the LED elements to be lit among the LED elements connected in series is changed. It is an object of the present invention to provide an LED lighting control circuit for a vehicle.

本発明の一態様に係る実施形態に従った車両用ＬＥＤ点灯制御回路は、
定電圧制御された電圧によりＬＥＤランプの点灯を制御する車両用ＬＥＤ点灯制御回路であって、
第１の電圧が供給される第１の配線と、
前記第１の電圧よりも低い第２の電圧が供給される第２の配線と、
アノードが前記第１の配線に接続され且つカソードが中間ノードに接続された第１のＬＥＤ素子と、アノードが前記中間ノードに接続され且つカソードが切換ノードに接続された第２のＬＥＤ素子とを含むＬＥＤランプと、
一端が前記切換ノードに接続された第１の調整抵抗と、
一端が前記第１の調整抵抗の他端に接続され、他端が前記第２の配線に接続された第２の調整抵抗と、
一端が前記第１の調整抵抗の前記一端に接続され、他端が前記第１の調整抵抗の前記他端に接続された調整用バイポーラトランジスタと、
一端が前記ＬＥＤランプの前記第１のＬＥＤ素子の前記アノードに接続され、他端が前記調整用バイポーラトランジスタの制御端子に接続された制限抵抗と、
一端が前記調整用バイポーラトランジスタの前記制御端子に接続され、他端が前記第２の調整抵抗の前記他端に接続され、前記調整用バイポーラトランジスタの前記制御端子と前記第２の調整抵抗の他端との間に基準電圧を印加する基準電圧生成回路と、
一端が前記第１の調整抵抗の他端に接続された補助調整抵抗と、
前記切換ノードと、前記中間ノードに接続された第１の接点との間が導通した第１の状態と、前記切換ノードと、前記補助調整抵抗の他端に接続された第２の接点との間が導通した第２の状態とを切り換えるスイッチ回路ＳＷと、を備える
ことを特徴とする。The LED lighting control circuit for a vehicle according to the embodiment according to one aspect of the present invention is
It is an LED lighting control circuit for vehicles that controls the lighting of LED lamps by a constant voltage controlled voltage.
The first wiring to which the first voltage is supplied and
A second wiring to which a second voltage lower than the first voltage is supplied, and
A first LED element in which the anode is connected to the first wiring and the cathode is connected to the intermediate node, and a second LED element in which the anode is connected to the intermediate node and the cathode is connected to the switching node. Including LED lamp and
A first adjustment resistor with one end connected to the switching node,
A second adjustment resistor having one end connected to the other end of the first adjustment resistor and the other end connected to the second wiring.
An adjustment bipolar transistor having one end connected to the other end of the first adjustment resistor and the other end connected to the other end of the first adjustment resistor.
A limiting resistor having one end connected to the anode of the first LED element of the LED lamp and the other end connected to the control terminal of the adjusting bipolar transistor.
One end is connected to the control terminal of the adjustment bipolar transistor, the other end is connected to the other end of the second adjustment resistor, and the control terminal of the adjustment bipolar transistor and the other of the second adjustment resistor are connected. A reference voltage generation circuit that applies a reference voltage between the ends and
Auxiliary adjustment resistor with one end connected to the other end of the first adjustment resistor,
A first state in which the switching node and the first contact connected to the intermediate node are electrically connected, and the switching node and the second contact connected to the other end of the auxiliary adjustment resistor. It is characterized by including a switch circuit SW for switching between a second state in which the nodes are electrically connected.

前記車両用ＬＥＤ点灯制御回路において、
前記基準電圧生成回路は、
アノード側が前記調整用バイポーラトランジスタの前記制御端子に接続され且つカソード側が前記第２の調整抵抗の他端に接続された、１つのダイオード又は直列に接続された複数のダイオードである
ことを特徴とする。In the LED lighting control circuit for vehicles
The reference voltage generation circuit is
The anode side is connected to the control terminal of the adjusting bipolar transistor, and the cathode side is connected to the other end of the second adjusting resistor, which is one diode or a plurality of diodes connected in series. ..

前記車両用ＬＥＤ点灯制御回路において、
前記基準電圧生成回路は、一端が前記調整用バイポーラトランジスタの前記制御端子に接続され、他端が前記第２の調整抵抗の前記他端に接続され、制御端子が前記第２の調整抵抗の前記一端に接続された基準電圧用バイポーラトランジスタである
ことを特徴とする。In the LED lighting control circuit for vehicles
One end of the reference voltage generation circuit is connected to the control terminal of the adjustment bipolar transistor, the other end is connected to the other end of the second adjustment resistor, and the control terminal is the control terminal of the second adjustment resistor. It is characterized by being a reference voltage bipolar transistor connected to one end.

前記車両用ＬＥＤ点灯制御回路において、
前記第２の調整抵抗の前記一端と前記第１の調整抵抗の前記他端との間に接続された第３の調整抵抗をさらに備える
ことを特徴とする。In the LED lighting control circuit for vehicles
A third adjusting resistor connected between the one end of the second adjusting resistor and the other end of the first adjusting resistor is further provided.

前記車両用ＬＥＤ点灯制御回路において、
前記第１の電圧と前記第２の電圧との間の電位差が少なくとも前記ＬＥＤランプが点灯する大きさである状態において、
前記第２の調整抵抗の電圧降下が第１の範囲にある場合には、前記調整用バイポーラトランジスタがオンして、前記ＬＥＤランプに流れるＬＥＤ電流が前記第１の調整抵抗を迂回するように制御し、
前記第２の調整抵抗の電圧降下が第１の範囲よりも高い第２の範囲にある場合に、前記調整用バイポーラトランジスタが不飽和領域で動作して前記ＬＥＤランプに流れる前記ＬＥＤ電流の値を目標値に制御し、
前記第２の調整抵抗の電圧降下が前記第２の範囲よりも高い第３の範囲にある場合に、前記調整用バイポーラトランジスタがオフして、前記ＬＥＤランプに流れる前記ＬＥＤ電流が前記第１の調整抵抗を流れるように制御する
ことを特徴とする。In the LED lighting control circuit for vehicles
In a state where the potential difference between the first voltage and the second voltage is at least large enough to light the LED lamp.
When the voltage drop of the second adjustment resistor is in the first range, the adjustment bipolar transistor is turned on and the LED current flowing through the LED lamp is controlled to bypass the first adjustment resistor. And
When the voltage drop of the second adjusting resistor is in the second range higher than the first range, the value of the LED current flowing through the LED lamp by operating the adjusting bipolar transistor in the unsaturated region is determined. Control to the target value,
When the voltage drop of the second adjusting resistor is in the third range higher than the second range, the adjusting bipolar transistor is turned off and the LED current flowing through the LED lamp is the first. It is characterized by controlling the adjustment resistor so that it flows.

前記車両用ＬＥＤ点灯制御回路において、
前記第１の電圧と前記第２の電圧との間の電位差が定電圧制御により、予め規定された規定電圧に近づくように制御されている
ことを特徴とする。In the LED lighting control circuit for vehicles
It is characterized in that the potential difference between the first voltage and the second voltage is controlled by constant voltage control so as to approach a predetermined defined voltage.

前記車両用ＬＥＤ点灯制御回路において、
前記スイッチ回路が前記第１の状態に切り換えられることにより、前記第１のＬＥＤ素子を点灯し且つ前記第２のＬＥＤ素子の前記アノードと前記カソードとを同電位にして前記第２のＬＥＤ素子を消灯させるとともに、前記補助調整抵抗の他端と前記第１の調整抵抗の前記一端との間を遮断し、
一方、前記スイッチ回路ＳＷが前記第２の状態に切り換えられることにより、前記第１のＬＥＤ素子及び前記第２のＬＥＤ素子を点灯させるとともに、前記補助調整抵抗の前記他端と第１の調整抵抗の前記一端との間を導通させる
ことを特徴とする。In the LED lighting control circuit for vehicles
When the switch circuit is switched to the first state, the first LED element is turned on and the anode and the cathode of the second LED element are set to the same potential to cause the second LED element to be turned on. While turning off the light, the other end of the auxiliary adjustment resistor and the one end of the first adjustment resistor are cut off.
On the other hand, when the switch circuit SW is switched to the second state, the first LED element and the second LED element are turned on, and the other end of the auxiliary adjustment resistor and the first adjustment resistor are turned on. It is characterized in that it conducts with the one end of the above.

前記車両用ＬＥＤ点灯制御回路において、
前記第１の電圧と前記第２の電圧との電位差の範囲は、前記調整用バイポーラトランジスタが少なくとも不飽和領域で動作する範囲に設定されている
ことを特徴とする。In the LED lighting control circuit for vehicles
The range of the potential difference between the first voltage and the second voltage is set to a range in which the adjusting bipolar transistor operates at least in an unsaturated region.

前記車両用ＬＥＤ点灯制御回路において、
前記車両用ＬＥＤ点灯制御回路は、二輪車に積載され、
前記ＬＥＤランプは、前記二輪車のヘッドライト、ウインカー、テールランプ、ポジションランプ、又は、メータイルミネーションの何れかである
ことを特徴とする。In the LED lighting control circuit for vehicles
The LED lighting control circuit for a vehicle is loaded on a two-wheeled vehicle.
The LED lamp is either a headlight, a blinker, a tail lamp, a position lamp, or a meter illumination of the motorcycle.

前記車両用ＬＥＤ点灯制御回路において、
前記補助調整抵抗の抵抗値は、前記第１の調整抵抗の抵抗値よりも、小さくなるように設定されていることを特徴とする。In the LED lighting control circuit for vehicles
The resistance value of the auxiliary adjustment resistor is set to be smaller than the resistance value of the first adjustment resistor.

前記車両用ＬＥＤ点灯制御回路において、
前記第１のＬＥＤ素子のみが点灯することにより、前記二輪車のヘッドライトのロービームの点灯を構成し、
前記第１のＬＥＤ素子及び前記第２のＬＥＤ素子が点灯することにより、前記二輪車のヘッドライトのハイビームの点灯を構成する
ことを特徴とする。In the LED lighting control circuit for vehicles
By lighting only the first LED element, the low beam of the headlight of the motorcycle is lit.
It is characterized in that the high beam of the headlight of the motorcycle is lit by lighting the first LED element and the second LED element.

前記車両用ＬＥＤ点灯制御回路において、
前記基準電圧用バイポーラトランジスタは、
コレクタが前記調整用バイポーラトランジスタの前記制御端子に接続され、エミッタが前記第２の調整抵抗の前記他端に接続され、制御端子が前記第２の調整抵抗の前記一端に接続されたＮＰＮ型バイポーラトランジスタである
ことを特徴とする。In the LED lighting control circuit for vehicles
The reference voltage bipolar transistor is
An NPN-type bipolar in which a collector is connected to the control terminal of the adjustment bipolar transistor, an emitter is connected to the other end of the second adjustment resistor, and a control terminal is connected to the end of the second adjustment resistor. It is characterized by being a transistor.

前記車両用ＬＥＤ点灯制御回路において、
前記スイッチ回路は、
前記ＬＥＤランプの点灯を制御するために、ユーザにより操作されるようになっていることを特徴とする。In the LED lighting control circuit for vehicles
The switch circuit
It is characterized in that it is operated by a user in order to control the lighting of the LED lamp.

本発明の一態様に係る実施形態に従った車両用ＬＥＤ点灯制御装置は、
定電圧制御された電圧によりＬＥＤランプの点灯を制御する車両用ＬＥＤ点灯制御回路と、
発電機が出力した交流電圧を直流電圧に変換して、第１の配線と第２の配線との間に電源電圧を供給する電源回路と、を備え、
前記車両用ＬＥＤ点灯制御回路は、
第１の電圧が供給される前記第１の配線と、
前記第１の電圧よりも低い第２の電圧が供給される前記第２の配線と、
アノードが前記第１の配線に接続され且つカソードが中間ノードに接続された第１のＬＥＤ素子と、アノードが前記中間ノードに接続され且つカソードが切換ノードに接続された第２のＬＥＤ素子とを含むＬＥＤランプと、
一端が前記切換ノードに接続された第１の調整抵抗と、
一端が前記第１の調整抵抗の他端に接続され、他端が前記第２の配線に接続された第２の調整抵抗と、
一端が前記第１の調整抵抗の前記一端に接続され、他端が前記第１の調整抵抗の前記他端に接続された調整用バイポーラトランジスタと、
一端が前記ＬＥＤランプの前記第１のＬＥＤ素子の前記アノードに接続され、他端が前記調整用バイポーラトランジスタの制御端子に接続された制限抵抗と、
一端が前記調整用バイポーラトランジスタの前記制御端子に接続され、他端が前記第２の調整抵抗の前記他端に接続され、前記調整用バイポーラトランジスタの前記制御端子と前記第２の調整抵抗の他端との間に基準電圧を印加する基準電圧生成回路と、
一端が前記第１の調整抵抗の他端に接続された補助調整抵抗と、
前記切換ノードと、前記中間ノードに接続された第１の接点との間が導通した第１の状態と、前記切換ノードと、前記補助調整抵抗の他端に接続された第２の接点との間が導通した第２の状態とを切り換えるスイッチ回路と、を備える
ることを特徴とする。The LED lighting control device for a vehicle according to the embodiment according to one aspect of the present invention is
A vehicle LED lighting control circuit that controls the lighting of LED lamps by a constant voltage controlled voltage,
It is equipped with a power supply circuit that converts the AC voltage output by the generator into a DC voltage and supplies the power supply voltage between the first wiring and the second wiring.
The vehicle LED lighting control circuit is
With the first wiring to which the first voltage is supplied,
With the second wiring to which a second voltage lower than the first voltage is supplied,
A first LED element in which the anode is connected to the first wiring and the cathode is connected to the intermediate node, and a second LED element in which the anode is connected to the intermediate node and the cathode is connected to the switching node. Including LED lamp and
A first adjustment resistor with one end connected to the switching node,
A second adjustment resistor having one end connected to the other end of the first adjustment resistor and the other end connected to the second wiring.
An adjustment bipolar transistor having one end connected to the other end of the first adjustment resistor and the other end connected to the other end of the first adjustment resistor.
A limiting resistor having one end connected to the anode of the first LED element of the LED lamp and the other end connected to the control terminal of the adjusting bipolar transistor.
One end is connected to the control terminal of the adjustment bipolar transistor, the other end is connected to the other end of the second adjustment resistor, and the control terminal of the adjustment bipolar transistor and the other of the second adjustment resistor are connected. A reference voltage generation circuit that applies a reference voltage between the ends and
Auxiliary adjustment resistor with one end connected to the other end of the first adjustment resistor,
A first state in which the switching node and the first contact connected to the intermediate node are electrically connected, and the switching node and the second contact connected to the other end of the auxiliary adjustment resistor. It is characterized by including a switch circuit for switching between a second state in which the nodes are electrically connected.

本発明の一態様に係る実施形態に従った車両用ＬＥＤ点灯制御装置の制御方法は、
定電圧制御された電圧によりＬＥＤランプの点灯を制御する車両用ＬＥＤ点灯制御回路であって、第１の電圧が供給される第１の配線と、前記第１の電圧よりも低い第２の電圧が供給される第２の配線と、アノードが前記第１の配線に接続され且つカソードが中間ノードに接続された第１のＬＥＤ素子と、アノードが前記中間ノードに接続され且つカソードが切換ノードに接続された第２のＬＥＤ素子とを含むＬＥＤランプと、一端が前記切換ノードに接続された第１の調整抵抗と、一端が前記第１の調整抵抗の他端に接続され、他端が前記第２の配線に接続された第２の調整抵抗と、一端が前記第１の調整抵抗の前記一端に接続され、他端が前記第１の調整抵抗の前記他端に接続された調整用バイポーラトランジスタと、一端が前記ＬＥＤランプの前記第１のＬＥＤ素子の前記アノードに接続され、他端が前記調整用バイポーラトランジスタの制御端子に接続された制限抵抗と、一端が前記調整用バイポーラトランジスタの前記制御端子に接続され、他端が前記第２の調整抵抗の前記他端に接続され、前記調整用バイポーラトランジスタの前記制御端子と前記第２の調整抵抗の他端との間に基準電圧を印加する基準電圧生成回路と、一端が前記第１の調整抵抗の他端に接続された補助調整抵抗と、前記切換ノードと、前記中間ノードに接続された第１の接点との間が導通した第１の状態と、前記切換ノードと、前記補助調整抵抗の他端に接続された第２の接点との間が導通した第２の状態とを切り換えるスイッチ回路ＳＷと、を備える車両用ＬＥＤ点灯制御回路の制御方法であって、
前記スイッチ回路が前記第１の状態に切り換えられることにより、前記第１のＬＥＤ素子を点灯し且つ前記第２のＬＥＤ素子の前記アノードと前記カソードとを同電位にして前記第２のＬＥＤ素子を消灯させるとともに、前記補助調整抵抗の他端と前記第１の調整抵抗の前記一端との間を遮断し、
一方、前記スイッチ回路ＳＷが前記第２の状態に切り換えられることにより、前記第１のＬＥＤ素子及び前記第２のＬＥＤ素子を点灯させるとともに、前記補助調整抵抗の他端と第１の調整抵抗の前記一端との間を導通させる
ことを特徴とする。The control method of the LED lighting control device for a vehicle according to the embodiment according to one aspect of the present invention is as follows.
A vehicle LED lighting control circuit that controls the lighting of an LED lamp by a constant voltage controlled voltage, a first wiring to which a first voltage is supplied, and a second voltage lower than the first voltage. The second wiring to which the voltage is supplied, the first LED element in which the anode is connected to the first wiring and the cathode is connected to the intermediate node, and the anode is connected to the intermediate node and the cathode is connected to the switching node. An LED lamp including a second LED element connected, a first adjustment resistor having one end connected to the switching node, and one end connected to the other end of the first adjustment resistor, the other end of which is said. A second adjustment resistor connected to the second wiring and an adjustment bipolar having one end connected to the one end of the first adjustment resistor and the other end connected to the other end of the first adjustment resistor. The transistor, a limiting resistor having one end connected to the anode of the first LED element of the LED lamp and the other end connected to the control terminal of the adjusting bipolar transistor, and one end of the adjusting bipolar transistor. It is connected to the control terminal, the other end is connected to the other end of the second adjustment resistor, and a reference voltage is applied between the control terminal of the adjustment bipolar transistor and the other end of the second adjustment resistor. The reference voltage generation circuit to be used, the auxiliary adjustment resistor whose one end is connected to the other end of the first adjustment resistor, the switching node, and the first contact connected to the intermediate node are conductive. LED lighting control for vehicles including a switch circuit SW for switching between the state 1 and the second state in which the switching node and the second contact connected to the other end of the auxiliary adjustment resistor are electrically connected. It ’s a circuit control method.
When the switch circuit is switched to the first state, the first LED element is turned on and the anode and the cathode of the second LED element are set to the same potential to cause the second LED element to be turned on. While turning off the light, the other end of the auxiliary adjustment resistor and the one end of the first adjustment resistor are cut off.
On the other hand, when the switch circuit SW is switched to the second state, the first LED element and the second LED element are turned on, and the other end of the auxiliary adjustment resistor and the first adjustment resistor are connected. It is characterized in that it conducts with one end thereof.

本発明の一態様に係る車両用ＬＥＤ点灯制御回路は、定電圧制御された電圧によりＬＥＤランプの点灯を制御する車両用ＬＥＤ点灯制御回路であって、第１の電圧が供給される第１の配線と、第１の電圧よりも低い第２の電圧が供給される第２の配線と、アノードが第１の配線に接続され且つカソードが中間ノードに接続された第１のＬＥＤ素子と、アノードが中間ノードに接続され且つカソードが切換ノードに接続された第２のＬＥＤ素子とを含むＬＥＤランプと、一端が切換ノードに接続された第１の調整抵抗と、一端が第１の調整抵抗の他端に接続され、他端が第２の配線に接続された第２の調整抵抗と、一端が第１の調整抵抗の一端に接続され、他端が第１の調整抵抗の他端に接続された調整用バイポーラトランジスタと、一端がＬＥＤランプの第１のＬＥＤ素子のアノードに接続され、他端が調整用バイポーラトランジスタの制御端子に接続された制限抵抗と、一端が調整用バイポーラトランジスタの制御端子に接続され、他端が第２の調整抵抗の他端に接続され、調整用バイポーラトランジスタの制御端子と第２の調整抵抗の他端との間に基準電圧を印加する基準電圧生成回路と、一端が第１の調整抵抗の他端に接続された補助調整抵抗と、切換ノードと、中間ノードに接続された第１の接点との間が導通した第１の状態と、切換ノードと、補助調整抵抗の他端に接続された第２の接点との間が導通した第２の状態とを切り換えるスイッチ回路と、を備える。 The vehicle LED lighting control circuit according to one aspect of the present invention is a vehicle LED lighting control circuit that controls the lighting of an LED lamp by a constant voltage controlled voltage, and is a first voltage to which a first voltage is supplied. The wiring, the second wiring to which a second voltage lower than the first voltage is supplied, the first LED element with the anode connected to the first wiring and the cathode connected to the intermediate node, and the anode. An LED lamp including a second LED element whose cathode is connected to the switching node and one end connected to the switching node, one end of the first adjusting resistor connected to the switching node, and one end of the first adjusting resistor. A second adjustment resistor connected to the other end and the other end connected to the second wiring, and one end connected to one end of the first adjustment resistor and the other end connected to the other end of the first adjustment resistor. Adjusting bipolar transistor, one end connected to the anode of the first LED element of the LED lamp, the other end connected to the control terminal of the adjusting bipolar transistor, and one end controlling the adjusting bipolar transistor. A reference voltage generation circuit that is connected to a terminal, the other end of which is connected to the other end of the second adjustment resistor, and applies a reference voltage between the control terminal of the adjustment bipolar transistor and the other end of the second adjustment resistor. The first state in which the auxiliary adjustment resistor, one end of which is connected to the other end of the first adjustment resistor, and the switching node and the first contact connected to the intermediate node are electrically connected, and the switching node, A switch circuit for switching between a second state in which the auxiliary adjustment resistor is connected to the other end of the auxiliary adjustment resistor and a second contact connected to the second contact is provided.

例えば、ロービームのＬＥＤランプを点灯させる場合には、流れる電流が規定値になるように、調整用バイポーラトランジスタに並列の抵抗の合成抵抗値を大きくする。 For example, when lighting a low-beam LED lamp, the combined resistance value of the resistor parallel to the adjusting bipolar transistor is increased so that the flowing current becomes a specified value.

一方、ハイビームのＬＥＤランプを点灯させる場合には、流れる電流が該規定値になるように、調整用バイポーラトランジスタに並列の抵抗の合成抵抗値を小さくする。 On the other hand, when the high beam LED lamp is turned on, the combined resistance value of the resistor parallel to the adjusting bipolar transistor is reduced so that the flowing current becomes the specified value.

このように、本発明の車両用ＬＥＤ点灯制御装置によれば、定電圧制御された電圧が供給されている場合に、直列に接続されたＬＥＤ素子のうち点灯させるＬＥＤ素子の段数を変化させても、ＬＥＤ電流を安定化させることができる。 As described above, according to the vehicle LED lighting control device of the present invention, when a constant voltage controlled voltage is supplied, the number of stages of the LED elements to be lit among the LED elements connected in series is changed. Also, the LED current can be stabilized.

図１は、実施例１に係る車両用ＬＥＤ点灯制御回路１００の構成の一例を示す図である。FIG. 1 is a diagram showing an example of the configuration of the vehicle LED lighting control circuit 100 according to the first embodiment. 図２は、図１に示す車両用ＬＥＤ点灯制御回路１００の第１のＬＥＤ素子Ｘ１の点灯時の切換状態の一例を示す図である。FIG. 2 is a diagram showing an example of a switching state when the first LED element X1 of the vehicle LED lighting control circuit 100 shown in FIG. 1 is lit. 図３は、図１に示す車両用ＬＥＤ点灯制御回路１００の第１及び第２のＬＥＤ素子Ｘ１、Ｘ２の点灯時の切換状態の一例を示す図である。FIG. 3 is a diagram showing an example of a switching state when the first and second LED elements X1 and X2 of the vehicle LED lighting control circuit 100 shown in FIG. 1 are lit. 図４は、図１に示す車両用ＬＥＤ点灯制御回路１００のＬＥＤ電流と抵抗のドロップ電圧との関係の一例を示す特性図である。FIG. 4 is a characteristic diagram showing an example of the relationship between the LED current of the vehicle LED lighting control circuit 100 shown in FIG. 1 and the drop voltage of the resistor. 図５は、図１に示す車両用ＬＥＤ点灯制御回路１００の調整用バイポーラトランジスタＱ１に流れる電流Ｉ１とその損失との関係の一例を示す特性図である。FIG. 5 is a characteristic diagram showing an example of the relationship between the current I1 flowing through the adjusting bipolar transistor Q1 of the vehicle LED lighting control circuit 100 shown in FIG. 1 and its loss. 図６は、実施例２に係る車両用ＬＥＤ点灯制御回路２００の構成の一例を示す図である。FIG. 6 is a diagram showing an example of the configuration of the vehicle LED lighting control circuit 200 according to the second embodiment. 図７は、車両用ＬＥＤ点灯制御回路１００を適用した車両用ＬＥＤ点灯制御装置１０００の構成の一例を示す図である。FIG. 7 is a diagram showing an example of the configuration of the vehicle LED lighting control device 1000 to which the vehicle LED lighting control circuit 100 is applied.

以下、本発明に係る実施形態について図面に基づいて説明する。 Hereinafter, embodiments according to the present invention will be described with reference to the drawings.

図１は、実施例１に係る車両用ＬＥＤ点灯制御回路１００の構成の一例を示す図である。また、図２は、図１に示す車両用ＬＥＤ点灯制御回路１００の第１のＬＥＤ素子Ｘ１の点灯時の切換状態の一例を示す図である。また、図３は、図１に示す車両用ＬＥＤ点灯制御回路１００の第１及び第２のＬＥＤ素子Ｘ１、Ｘ２の点灯時の切換状態の一例を示す図である。また、図４は、図１に示す車両用ＬＥＤ点灯制御回路１００のＬＥＤ電流と抵抗のドロップ電圧との関係の一例を示す特性図である。また、図５は、図１に示す車両用ＬＥＤ点灯制御回路１００の調整用バイポーラトランジスタＱ１に流れる電流Ｉ１とその損失との関係の一例を示す特性図である。 FIG. 1 is a diagram showing an example of the configuration of the vehicle LED lighting control circuit 100 according to the first embodiment. Further, FIG. 2 is a diagram showing an example of a switching state when the first LED element X1 of the vehicle LED lighting control circuit 100 shown in FIG. 1 is lit. Further, FIG. 3 is a diagram showing an example of a switching state when the first and second LED elements X1 and X2 of the vehicle LED lighting control circuit 100 shown in FIG. 1 are lit. Further, FIG. 4 is a characteristic diagram showing an example of the relationship between the LED current of the vehicle LED lighting control circuit 100 shown in FIG. 1 and the drop voltage of the resistor. Further, FIG. 5 is a characteristic diagram showing an example of the relationship between the current I1 flowing through the adjusting bipolar transistor Q1 of the vehicle LED lighting control circuit 100 shown in FIG. 1 and its loss.

この実施例１に係る車両用ＬＥＤ点灯制御回路１００は、二輪車等の車両（図示せず）に積載され、定電圧制御された電圧により、当該二輪車に積載されるＬＥＤランプＸの点灯を制御するようになっている。 The vehicle LED lighting control circuit 100 according to the first embodiment is loaded on a vehicle (not shown) such as a two-wheeled vehicle, and controls the lighting of the LED lamp X loaded on the two-wheeled vehicle by a constant voltage controlled voltage. It has become like.

ここで、例えば、図１に示すように、この車両用ＬＥＤ点灯制御回路１００は、第１の配線Ｈ１と、第２の配線Ｈ２と、第１の端子Ｔ１と、第２の端子Ｔ２と、ＬＥＤランプＸと、第１の調整抵抗Ｒ１と、第２の調整抵抗Ｒ２と、調整用バイポーラトランジスタＱ１と、制限抵抗ＲＳと、基準電圧生成回路Ｙと、補助調整抵抗Ｒ１ａと、スイッチ回路ＳＷと、を備える。 Here, for example, as shown in FIG. 1, the vehicle LED lighting control circuit 100 includes a first wiring H1, a second wiring H2, a first terminal T1, and a second terminal T2. LED lamp X, first adjustment resistor R1, second adjustment resistor R2, adjustment bipolar transistor Q1, limiting resistor RS, reference voltage generation circuit Y, auxiliary adjustment resistor R1a, switch circuit SW , Equipped with.

そして、ＬＥＤランプＸは、例えば、図１に示すように、カソード側ｃが第１の調整抵抗Ｒ１の一端（切換ノードＴＳＷ）に接続され且つアノード側ａが第１の配線Ｈ１（第１の端子Ｔ１）に接続されている。 Then, as shown in FIG. 1, for example, in the LED lamp X, the cathode side c is connected to one end (switching node TSW) of the first adjustment resistor R1 and the anode side a is the first wiring H1 (first wiring H1). It is connected to the terminal T1).

このＬＥＤランプＸは、１つＬＥＤ素子又は直列に接続された複数のＬＥＤ素子で構成されている。図１の例では、ＬＥＤランプＸは、直列に接続されたＬＥＤ素子Ｘ１と、ＬＥＤ素子Ｘ２を含む。 The LED lamp X is composed of one LED element or a plurality of LED elements connected in series. In the example of FIG. 1, the LED lamp X includes an LED element X1 and an LED element X2 connected in series.

そして、第１のＬＥＤ素子Ｘ１は、アノードが第１の配線Ｈ１に接続され且つカソードが中間ノードＴＸに接続されている。なお、図１の例では、この第１のＬＥＤ素子Ｘ１は、２つのＬＥＤ素子が直列に接続されて構成されているが、１つのＬＥＤ素子又は３つ以上のＬＥＤ素子で構成されていてもよい。 Then, in the first LED element X1, the anode is connected to the first wiring H1 and the cathode is connected to the intermediate node TX. In the example of FIG. 1, the first LED element X1 is configured by connecting two LED elements in series, but may be configured by one LED element or three or more LED elements. Good.

また、第２のＬＥＤ素子Ｘ２は、アノードが中間ノードＴＸに接続され且つカソードが切換ノードＴＳＷに接続されている。なお、図１の例では、この第２のＬＥＤ素子Ｘ２は、１つのＬＥＤ素子で構成されているが、２つ以上のＬＥＤ素子で構成されていてもよい。 Further, in the second LED element X2, the anode is connected to the intermediate node TX and the cathode is connected to the switching node TSW. In the example of FIG. 1, the second LED element X2 is composed of one LED element, but may be composed of two or more LED elements.

このＬＥＤランプＸは、例えば、既述の二輪車のヘッドライト、ウインカー、テールランプ、ポジションランプ、又は、メータイルミネーションの何れかである。 The LED lamp X is, for example, any of the headlights, blinkers, tail lamps, position lamps, and meter illuminations of the two-wheeled vehicle described above.

ここで、例えば、第１のＬＥＤ素子Ｘ１のみが点灯することにより、既述の二輪車のヘッドライトのロービームの点灯を構成するようになっている。 Here, for example, by lighting only the first LED element X1, the low beam of the headlight of the motorcycle described above is lit.

そして、例えば、第１のＬＥＤ素子Ｘ１及び第２のＬＥＤ素子Ｘ２が点灯することにより、既述の二輪車のヘッドライトのハイビームの点灯を構成するようになっている。 Then, for example, by lighting the first LED element X1 and the second LED element X2, the high beam of the headlight of the motorcycle described above is lit.

また、第１の配線Ｈ１は、第１の電圧Ｖ１が供給されるようになっている。この第１の配線Ｈ１は、第１の端子Ｔ１に接続されている。 Further, the first wiring H1 is supplied with the first voltage V1. The first wiring H1 is connected to the first terminal T1.

なお、図１の例では、第１の電圧Ｖ１は、接地電圧である。 In the example of FIG. 1, the first voltage V1 is the ground voltage.

また、第２の配線Ｈ２は、第１の電圧Ｖ１よりも低い第２の電圧Ｖ２が供給されるようになっている。 Further, the second wiring H2 is supplied with a second voltage V2 which is lower than the first voltage V1.

なお、図１の例では、第２の電圧Ｖ２は、電源電圧（ここでは負電圧）である。この電源電圧は、電源回路等のレギュレータにより、定電圧制御されている。 In the example of FIG. 1, the second voltage V2 is a power supply voltage (here, a negative voltage). This power supply voltage is controlled by a regulator such as a power supply circuit at a constant voltage.

すなわち、ここでは、第１の電圧Ｖ１（接地電圧）と第２の電圧Ｖ２（電源電圧）との間の電位差が、定電圧制御（レギュレータ）により、予め規定された規定電圧に近づくように制御されている。 That is, here, the potential difference between the first voltage V1 (ground voltage) and the second voltage V2 (power supply voltage) is controlled by the constant voltage control (regulator) so as to approach a predetermined specified voltage. Has been done.

そして、第１の電圧Ｖ１と第２の電圧Ｖ２との電位差の範囲は、後述のように、調整用バイポーラトランジスタＱ１が少なくとも不飽和領域で動作する範囲に設定されている。 The range of the potential difference between the first voltage V1 and the second voltage V2 is set to a range in which the adjusting bipolar transistor Q1 operates at least in an unsaturated region, as will be described later.

また、第１の調整抵抗Ｒ１は、一端が切換ノードＴＳＷ及びＬＥＤランプＸのカソード側ｃに接続されている。 Further, one end of the first adjustment resistor R1 is connected to the switching node TSW and the cathode side c of the LED lamp X.

また、第２の調整抵抗Ｒ２は、一端が第１の調整抵抗Ｒ１の他端に接続され、他端が第２の配線Ｈ２に接続されている。 Further, one end of the second adjustment resistor R2 is connected to the other end of the first adjustment resistor R1, and the other end is connected to the second wiring H2.

また、調整用バイポーラトランジスタＱ１は、一端（コレクタ）が第１の調整抵抗Ｒ１の一端（切換ノードＴＳＷ）に接続され、他端（エミッタ）が第１の調整抵抗Ｒ１の他端（第２の調整抵抗Ｒ２の一端）に接続されている。 Further, in the adjustment bipolar transistor Q1, one end (collector) is connected to one end (switching node TSW) of the first adjustment resistor R1, and the other end (emitter) is the other end (second) of the first adjustment resistor R1. It is connected to one end of the adjustment resistor R2).

この調整用バイポーラトランジスタＱ１は、例えば、図１に示すように、コレクタが第１の調整抵抗Ｒ１の一端に接続され、エミッタが第１の調整抵抗Ｒ１の他端に接続され、ベースが基準電圧生成回路Ｙの一端に接続されたＮＰＮ型バイポーラトランジスタである。 In this adjustment bipolar transistor Q1, for example, as shown in FIG. 1, the collector is connected to one end of the first adjustment resistor R1, the emitter is connected to the other end of the first adjustment resistor R1, and the base is the reference voltage. It is an NPN type bipolar transistor connected to one end of the generation circuit Y.

そして、第１の電圧Ｖ１と第２の電圧Ｖ２との電位差の範囲は、この調整用バイポーラトランジスタＱ１が少なくとも不飽和領域で動作する範囲に設定されている。 The range of the potential difference between the first voltage V1 and the second voltage V2 is set to a range in which the adjusting bipolar transistor Q1 operates at least in an unsaturated region.

また、制限抵抗ＲＳは、一端がＬＥＤランプＸのアノード側ａ（ＬＥＤランプＸの第１のＬＥＤ素子Ｘ１のアノード（第１の配線Ｈ１））に接続され、他端が調整用バイポーラトランジスタＱ１の制御端子（ベース）に接続されている。 Further, one end of the limiting resistor RS is connected to the anode side a of the LED lamp X (the anode of the first LED element X1 of the LED lamp X (first wiring H1)), and the other end is the adjusting bipolar transistor Q1. It is connected to the control terminal (base).

また、基準電圧生成回路Ｙは、一端が調整用バイポーラトランジスタＱ１の制御端子（ベース）及び制限抵抗ＲＳの他端に接続され、他端が第２の調整抵抗Ｒ２の他端に接続されている。 Further, one end of the reference voltage generation circuit Y is connected to the control terminal (base) of the adjustment bipolar transistor Q1 and the other end of the limiting resistor RS, and the other end is connected to the other end of the second adjusting resistor R2. ..

この基準電圧生成回路Ｙは、調整用バイポーラトランジスタＱ１の制御端子（ベース）と第２の調整抵抗Ｒ２の他端との間に基準電圧を印加する（すなわち、当該基準電圧の電位差を生成する）ようになっている。 The reference voltage generation circuit Y applies a reference voltage between the control terminal (base) of the adjustment bipolar transistor Q1 and the other end of the second adjustment resistor R2 (that is, generates a potential difference of the reference voltage). It has become like.

この基準電圧生成回路Ｙは、例えば、図１に示すように、アノード側が調整用バイポーラトランジスタＱ１の制御端子（ベース）に接続され且つカソード側が第２の調整抵抗Ｒ２の他端に接続された、１つのダイオード又は直列に接続された複数のダイオードである。 In this reference voltage generation circuit Y, for example, as shown in FIG. 1, the anode side is connected to the control terminal (base) of the adjustment bipolar transistor Q1 and the cathode side is connected to the other end of the second adjustment resistor R2. One diode or multiple diodes connected in series.

なお、図１の例では、この基準電圧生成回路Ｙは、２つのダイオードが直列に接続されて構成されている。この場合、既述の基準電圧は、２つのダイオード分の順電圧である。 In the example of FIG. 1, the reference voltage generation circuit Y is configured by connecting two diodes in series. In this case, the above-mentioned reference voltage is the forward voltage of two diodes.

また、補助調整抵抗Ｒ１ａは、一端が第１の調整抵抗Ｒ１の他端に接続され、他端がスイッチ回路ＳＷの第２の接点Ｈｉに接続されている。 Further, one end of the auxiliary adjustment resistor R1a is connected to the other end of the first adjustment resistor R1, and the other end is connected to the second contact Hi of the switch circuit SW.

なお、この補助調整抵抗Ｒ１ａの抵抗値は、例えば、第１の調整抵抗Ｒ１の抵抗値よりも、小さくなるように設定されている。 The resistance value of the auxiliary adjustment resistor R1a is set to be smaller than, for example, the resistance value of the first adjustment resistor R1.

また、スイッチ回路ＳＷは、例えば、図１に示すように、第１の接点Ｌｏと、第２の接点Ｈｉと、切換ノードＴＳＷとを備える。 Further, the switch circuit SW includes, for example, as shown in FIG. 1, a first contact Lo, a second contact Hi, and a switching node TSW.

このスイッチ回路ＳＷは、ＬＥＤランプＸの点灯を制御するために、ユーザにより操作されるようになっている。 This switch circuit SW is operated by a user in order to control the lighting of the LED lamp X.

このスイッチ回路ＳＷは、ユーザの操作により、切換ノードＴＳＷと、中間ノードＴＸに接続された第１の接点Ｌｏとの間が導通した第１の状態（図２）と、切換ノードＴＳＷと、補助調整抵抗Ｒ１ａの他端に接続された第２の接点Ｈｉとの間が導通した第２の状態（図３）とを切り換えるようになっている。 This switch circuit SW includes a first state (FIG. 2) in which the switching node TSW and the first contact Lo connected to the intermediate node TX are electrically connected by a user operation, a switching node TSW, and an auxiliary. The second state (FIG. 3) in which the second contact Hi connected to the other end of the adjustment resistor R1a is electrically connected is switched.

例えば、このスイッチ回路ＳＷが第１の状態（図２）に切り換えられることにより、第１のＬＥＤ素子Ｘ１を点灯し且つ第２のＬＥＤ素子Ｘ２のアノードとカソードとを同電位にして第２のＬＥＤ素子Ｘ２を消灯させるとともに、補助調整抵抗Ｒ１ａの他端と第１の調整抵抗Ｒ１の一端（切換ノードＴＳＷ）との間を遮断する。 For example, when the switch circuit SW is switched to the first state (FIG. 2), the first LED element X1 is turned on and the anode and cathode of the second LED element X2 are set to the same potential for the second LED element X1. The LED element X2 is turned off, and the other end of the auxiliary adjustment resistor R1a and one end (switching node TSW) of the first adjustment resistor R1 are cut off.

すなわち、このスイッチ回路ＳＷが当該第１の状態に切り換えられることにより、第１のＬＥＤ素子Ｘ１が点灯し且つ第２のＬＥＤ素子Ｘ２が消灯するとともに、補助調整抵抗Ｒ１ａに電流が流れない状態になる（図２）。 That is, when the switch circuit SW is switched to the first state, the first LED element X1 is turned on and the second LED element X2 is turned off, and no current flows through the auxiliary adjustment resistor R1a. (Fig. 2).

これにより、例えば、ロービームのＬＥＤランプ（２段のＬＥＤ素子）を点灯させる場合には、ＬＥＤランプＸに流れる電流が規定値になるように、調整用バイポーラトランジスタＱ１に並列の抵抗の合成抵抗値を大きくする（第１の調整抵抗Ｒ１の抵抗値にする）ことができる（図２）。 As a result, for example, when lighting a low-beam LED lamp (two-stage LED element), the combined resistance value of the resistance parallel to the adjustment bipolar transistor Q1 so that the current flowing through the LED lamp X becomes a specified value. Can be increased (to the resistance value of the first adjustment resistor R1) (FIG. 2).

一方、このスイッチ回路ＳＷが第２の状態に切り換えられることにより、第１のＬＥＤ素子Ｘ１及び第２のＬＥＤ素子Ｘ２を点灯させるとともに、補助調整抵抗Ｒ１ａの他端と第１の調整抵抗Ｒ１の一端（切換ノードＴＳＷ）との間を導通させる。 On the other hand, when the switch circuit SW is switched to the second state, the first LED element X1 and the second LED element X2 are turned on, and the other end of the auxiliary adjustment resistor R1a and the first adjustment resistor R1 are turned on. Conducting between one end (switching node TSW).

すなわち、スイッチ回路ＳＷが当該第２の状態に切り換えられることにより、第１のＬＥＤ素子Ｘ１及び第２のＬＥＤ素子Ｘ２が点灯するとともに、補助調整抵抗Ｒ１ａに電流が流れる状態になる（図３）。 That is, when the switch circuit SW is switched to the second state, the first LED element X1 and the second LED element X2 are turned on, and a current flows through the auxiliary adjustment resistor R1a (FIG. 3). ..

これにより、例えば、ハイビームのＬＥＤランプ（３段のＬＥＤ素子）を点灯させる場合には、ＬＥＤランプＸに流れる電流が該規定値になるように、調整用バイポーラトランジスタＱ１に並列の抵抗の合成抵抗値を小さくする（第１の調整抵抗Ｒ１と補助調整抵抗Ｒ１ａとの合成抵抗の抵抗値になる）ことができる（図３）。 As a result, for example, when lighting a high-beam LED lamp (three-stage LED element), the combined resistance of a resistor parallel to the adjustment bipolar transistor Q1 so that the current flowing through the LED lamp X becomes the specified value. The value can be reduced (it becomes the resistance value of the combined resistance of the first adjusting resistor R1 and the auxiliary adjusting resistor R1a) (FIG. 3).

このように、車両用ＬＥＤ点灯制御回路１００において、定電圧制御された電圧が供給されている場合に、ＬＥＤランプＸの直列に接続されたＬＥＤ素子のうち、点灯させるＬＥＤ素子の段数を変化させても、ＬＥＤ電流を安定化させることができる。 In this way, in the vehicle LED lighting control circuit 100, when a constant voltage controlled voltage is supplied, the number of stages of the LED elements to be lit is changed among the LED elements connected in series with the LED lamp X. However, the LED current can be stabilized.

ここで、例えば、第１の電圧Ｖ１と第２の電圧Ｖ２との間の電位差が少なくともＬＥＤランプＸが点灯する（例えば、スイッチ回路ＳＷが第１の状態で、少なくとも第１のＬＥＤ素子Ｘ１が点灯する）大きさである状態において、第２の調整抵抗Ｒ２の電圧降下が第１の範囲Ｅ１にある場合には、調整用バイポーラトランジスタＱ１がオンして、ＬＥＤランプＸに流れるＬＥＤ電流ＩＸが第１の調整抵抗Ｒ１を迂回するように制御するようになっている（図４）。 Here, for example, the potential difference between the first voltage V1 and the second voltage V2 causes at least the LED lamp X to light up (for example, when the switch circuit SW is in the first state, at least the first LED element X1 is lit. When the voltage drop of the second adjustment resistor R2 is in the first range E1 in the state of the size (lights up), the adjustment bipolar transistor Q1 is turned on and the LED current IX flowing through the LED lamp X is changed. It is controlled so as to bypass the first adjustment resistor R1 (FIG. 4).

そして、上記状態において、第２の調整抵抗Ｒ２の電圧降下が第１の範囲Ｅ１よりも高い（大きい）第２の範囲Ｅ２にある場合に、調整用バイポーラトランジスタＱ１が不飽和領域で動作してＬＥＤランプＸに流れるＬＥＤ電流ＩＸの値を目標値（一定値）に制御するようになっている（例えば、図４の７００ｍＡ）。 Then, in the above state, when the voltage drop of the second adjustment resistor R2 is in the second range E2 which is higher (larger) than the first range E1, the adjustment bipolar transistor Q1 operates in the unsaturated region. The value of the LED current IX flowing through the LED lamp X is controlled to a target value (constant value) (for example, 700 mA in FIG. 4).

さらに、上記状態において、第２の調整抵抗Ｒ２の電圧降下が第２の範囲Ｅ２よりも高い（大きい）第３の範囲Ｅ３にある場合に、調整用バイポーラトランジスタＱ１がオフして、ＬＥＤランプＸに流れるＬＥＤ電流ＩＸが第１の調整抵抗Ｒ１を流れるように制御するようになっている。 Further, in the above state, when the voltage drop of the second adjustment resistor R2 is in the third range E3 which is higher (larger) than the second range E2, the adjustment bipolar transistor Q1 is turned off and the LED lamp X is turned off. The LED current IX flowing through the first adjusting resistor R1 is controlled to flow through the first adjusting resistor R1.

次に、以上のような構成を有し、定電圧制御された電圧によりＬＥＤランプの点灯を制御する車両用ＬＥＤ点灯制御回路１００の制御方法の一例について、説明する。 Next, an example of a control method of the vehicle LED lighting control circuit 100 having the above configuration and controlling the lighting of the LED lamp by the constant voltage controlled voltage will be described.

ここで、既述のように、第１の電圧Ｖ１（接地電圧）と第２の電圧Ｖ２（電源電圧）との間の電位差が、定電圧制御（レギュレータ）により、予め規定された規定電圧に近づくように制御されている。さらに、第１の電圧Ｖ１と第２の電圧Ｖ２との電位差の範囲は、調整用バイポーラトランジスタＱ１が少なくとも不飽和領域で動作する範囲に設定されているものとする。 Here, as described above, the potential difference between the first voltage V1 (ground voltage) and the second voltage V2 (power supply voltage) becomes a predetermined voltage specified in advance by the constant voltage control (regulator). It is controlled to approach. Further, it is assumed that the range of the potential difference between the first voltage V1 and the second voltage V2 is set to a range in which the adjusting bipolar transistor Q1 operates at least in an unsaturated region.

例えば、車両用ＬＥＤ点灯制御回路１００は、第１の電圧Ｖ１と第２の電圧Ｖ２との間の電位差が少なくともＬＥＤランプＸが点灯する大きさである状態において、第２の調整抵抗Ｒ２の電圧降下が第１の範囲Ｅ１にある場合には、調整用バイポーラトランジスタＱ１をオンする。 For example, in the vehicle LED lighting control circuit 100, the voltage of the second adjustment resistor R2 is such that the potential difference between the first voltage V1 and the second voltage V2 is at least the magnitude at which the LED lamp X is lit. When the drop is in the first range E1, the adjustment bipolar transistor Q1 is turned on.

これにより、ＬＥＤランプＸに流れるＬＥＤ電流ＩＸが第１の調整抵抗Ｒ１を迂回するように制御される。すなわち、ＬＥＤランプＸに直列に接続される抵抗の抵抗値が小さくなるように制御される。 As a result, the LED current IX flowing through the LED lamp X is controlled so as to bypass the first adjustment resistor R1. That is, the resistance value of the resistor connected in series with the LED lamp X is controlled to be small.

したがって、例えば、電源電圧の絶対値が小さい場合、ＬＥＤランプＸに流れるＬＥＤ電流ＩＸが第２の抵抗Ｒ２の傾きで決定されることとなる（図４）。 Therefore, for example, when the absolute value of the power supply voltage is small, the LED current IX flowing through the LED lamp X is determined by the slope of the second resistor R2 (FIG. 4).

すなわち、規定電圧に定電圧制御された電源電圧の絶対値が小さくても、ＬＥＤランプＸに点灯可能な電圧が印加されることとなる（ＬＥＤ電流ＩＸの値を目標値に近づけることができる）。 That is, even if the absolute value of the power supply voltage controlled by a constant voltage is small to the specified voltage, a voltage that can be lit is applied to the LED lamp X (the value of the LED current IX can be brought close to the target value). ..

また、車両用ＬＥＤ点灯制御回路１００は、上記状態において、第２の調整抵抗Ｒ２の電圧降下が第１の範囲Ｅ１よりも高い（大きい）第２の範囲Ｅ２にある場合に、調整用バイポーラトランジスタＱ１を不飽和領域で動作させる。 Further, the vehicle LED lighting control circuit 100 is a bipolar transistor for adjustment when the voltage drop of the second adjustment resistor R2 is in the second range E2 which is higher (larger) than the first range E1 in the above state. Operate Q1 in the unsaturated region.

これにより、ＬＥＤランプＸに流れるＬＥＤ電流ＩＸが第１の調整抵抗Ｒ１及び不飽和動作する調整用バイポーラトランジスタＱ１に流れることとなる。 As a result, the LED current IX flowing through the LED lamp X flows through the first adjusting resistor R1 and the adjusting bipolar transistor Q1 that operates unsaturatedly.

すなわち、ＬＥＤランプＸに流れるＬＥＤ電流ＩＸの値が目標値（一定値）に制御される（例えば、図４の７００ｍＡ）。 That is, the value of the LED current IX flowing through the LED lamp X is controlled to a target value (constant value) (for example, 700 mA in FIG. 4).

また、車両用ＬＥＤ点灯制御回路１００は、上記状態において、第２の調整抵抗Ｒ２の電圧降下が第２の範囲Ｅ２よりも高い（大きい）第３の範囲Ｅ３にある場合に、調整用バイポーラトランジスタＱ１がオフする。 Further, the vehicle LED lighting control circuit 100 is a bipolar transistor for adjustment when the voltage drop of the second adjustment resistor R2 is in the third range E3, which is higher (larger) than the second range E2, in the above state. Q1 turns off.

これにより、ＬＥＤランプＸに流れるＬＥＤ電流ＩＸが第１の調整抵抗Ｒ１を流れるように制御される。すなわち、ＬＥＤランプＸに直列に接続される抵抗の抵抗値が大きくなるように制御される。 As a result, the LED current IX flowing through the LED lamp X is controlled to flow through the first adjusting resistor R1. That is, the resistance value of the resistor connected in series with the LED lamp X is controlled to be large.

したがって、例えば、電源電圧の絶対値が大きい場合、ＬＥＤランプＸに流れるＬＥＤ電流ＩＸが第１の抵抗Ｒ１と第２の抵抗Ｒ２の傾きで決定されることとなる（図４）。 Therefore, for example, when the absolute value of the power supply voltage is large, the LED current IX flowing through the LED lamp X is determined by the inclination of the first resistor R1 and the second resistor R2 (FIG. 4).

すなわち、規定電圧に定電圧制御された電源電圧の絶対値が大きくても、ＬＥＤランプＸに印加される電圧を低く（ＬＥＤ電流ＩＸが大きくならないように）することができる。 That is, even if the absolute value of the power supply voltage controlled by a constant voltage to the specified voltage is large, the voltage applied to the LED lamp X can be reduced (so that the LED current IX does not increase).

以上の車両用ＬＥＤ点灯制御回路１００の制御方法により、簡易な構成にて、電源電圧に応じて、ＬＥＤランプＸに直列に接続される抵抗の抵抗値を制御することで、ＬＥＤランプＸのＬＥＤ電流が安定するように制御されることとなる。 By controlling the LED lighting control circuit 100 for a vehicle as described above, the LED of the LED lamp X can be controlled by controlling the resistance value of the resistor connected in series with the LED lamp X according to the power supply voltage with a simple configuration. The current will be controlled to be stable.

以上のように、実施例１に係る車両用ＬＥＤ点灯制御回路１００は、第２の調整抵抗Ｒ２の電圧降下が第１の範囲にある場合（すなわち、電源電圧が低い、又はＬＥＤランプＸのＶＦ電圧が大きい場合）には、調整用バイポーラトランジスタＱ１がオンして、ＬＥＤランプＸに流れるＬＥＤ電流が第１の調整抵抗Ｒ１を迂回するように制御する。 As described above, in the vehicle LED lighting control circuit 100 according to the first embodiment, when the voltage drop of the second adjustment resistor R2 is in the first range (that is, the power supply voltage is low, or the VF of the LED lamp X is VF. When the voltage is large), the adjustment bipolar transistor Q1 is turned on, and the LED current flowing through the LED lamp X is controlled to bypass the first adjustment resistor R1.

そして、車両用ＬＥＤ点灯制御回路１００は、第２の調整抵抗Ｒ２の電圧降下が第１の範囲よりも高い第２の範囲にある場合に、調整用バイポーラトランジスタＱ１が不飽和領域で動作してＬＥＤランプＸに流れるＬＥＤ電流の値を目標値（一定）に制御する。 Then, in the vehicle LED lighting control circuit 100, when the voltage drop of the second adjusting resistor R2 is in the second range higher than the first range, the adjusting bipolar transistor Q1 operates in the unsaturated region. The value of the LED current flowing through the LED lamp X is controlled to a target value (constant).

そして、車両用ＬＥＤ点灯制御回路１００は、第２の調整抵抗の電圧降下が第２の範囲よりも高い第３の範囲にある場合（すなわち、電源電圧が高い、又はＶＦ電圧が小さい場合）に、調整用バイポーラトランジスタＱ１がオフして、ＬＥＤランプＸに流れるＬＥＤ電流が第１の調整抵抗Ｒ１を流れるように制御する。 Then, the vehicle LED lighting control circuit 100 is used when the voltage drop of the second adjustment resistor is in the third range higher than the second range (that is, when the power supply voltage is high or the VF voltage is low). The adjustment bipolar transistor Q1 is turned off, and the LED current flowing through the LED lamp X is controlled to flow through the first adjustment resistor R1.

これにより、簡易な構成にて、電源電圧に応じて、ＬＥＤランプＸに直列に接続される抵抗の抵抗値を制御することで、ＬＥＤランプＸのＬＥＤ電流が安定するように制御されることとなる。 As a result, in a simple configuration, the LED current of the LED lamp X is controlled to be stable by controlling the resistance value of the resistor connected in series with the LED lamp X according to the power supply voltage. Become.

そして、特に、既述のように、ユーザの操作により、スイッチ回路ＳＷが、切換ノードＴＳＷと、中間ノードＴＸに接続された第１の接点Ｌｏとの間が導通した第１の状態（図２）と、切換ノードＴＳＷと、補助調整抵抗Ｒ１ａの他端に接続された第２の接点（Ｈｉ）との間が導通した第２の状態（図３）とを切り換える。 Then, in particular, as described above, the switch circuit SW is in a first state in which the switching node TSW and the first contact Lo connected to the intermediate node TX are electrically connected by the user's operation (FIG. 2). ) And the second state (FIG. 3) in which the switching node TSW and the second contact (Hi) connected to the other end of the auxiliary adjustment resistor R1a are electrically connected.

既述のように、このスイッチ回路ＳＷが第１の状態（図２）に切り換えられることにより、第１のＬＥＤ素子Ｘ１を点灯し且つ第２のＬＥＤ素子Ｘ２のアノードとカソードとを同電位にして第２のＬＥＤ素子Ｘ２を消灯させるとともに、補助調整抵抗Ｒ１ａの他端と第１の調整抵抗Ｒ１の一端（切換ノードＴＳＷ）との間を遮断する。 As described above, by switching the switch circuit SW to the first state (FIG. 2), the first LED element X1 is turned on and the anode and cathode of the second LED element X2 are set to the same potential. The second LED element X2 is turned off, and the other end of the auxiliary adjustment resistor R1a and one end (switching node TSW) of the first adjustment resistor R1 are cut off.

すなわち、このスイッチ回路ＳＷが当該第１の状態に切り換えられることにより、第１のＬＥＤ素子Ｘ１が点灯し且つ第２のＬＥＤ素子Ｘ２が消灯するとともに、補助調整抵抗Ｒ１ａに電流が流れない状態になる（図２）。 That is, when the switch circuit SW is switched to the first state, the first LED element X1 is turned on and the second LED element X2 is turned off, and no current flows through the auxiliary adjustment resistor R1a. (Fig. 2).

これにより、例えば、ロービームのＬＥＤランプ（２段のＬＥＤ素子）を点灯させる場合には、ＬＥＤランプＸに流れる電流が規定値になるように、調整用バイポーラトランジスタＱ１に並列の抵抗の合成抵抗値を大きくする（第１の調整抵抗Ｒ１の抵抗値にする）ことができる（図２）。 As a result, for example, when lighting a low-beam LED lamp (two-stage LED element), the combined resistance value of the resistance parallel to the adjustment bipolar transistor Q1 so that the current flowing through the LED lamp X becomes a specified value. Can be increased (to the resistance value of the first adjustment resistor R1) (FIG. 2).

一方、既述のように、このスイッチ回路ＳＷが第２の状態に切り換えられることにより、第１のＬＥＤ素子Ｘ１及び第２のＬＥＤ素子Ｘ２を点灯させるとともに、補助調整抵抗Ｒ１ａの他端と第１の調整抵抗Ｒ１の一端（切換ノードＴＳＷ）との間を導通させる。 On the other hand, as described above, when the switch circuit SW is switched to the second state, the first LED element X1 and the second LED element X2 are turned on, and the other end and the second of the auxiliary adjustment resistor R1a are turned on. Conduction is made between one end (switching node TSW) of the adjustment resistor R1 of 1.

すなわち、スイッチ回路ＳＷが当該第２の状態に切り換えられることにより、第１のＬＥＤ素子Ｘ１及び第２のＬＥＤ素子Ｘ２が点灯するとともに、補助調整抵抗Ｒ１ａに電流が流れる状態になる（図３）。 That is, when the switch circuit SW is switched to the second state, the first LED element X1 and the second LED element X2 are turned on, and a current flows through the auxiliary adjustment resistor R1a (FIG. 3). ..

これにより、例えば、ハイビームのＬＥＤランプ（３段のＬＥＤ素子）を点灯させる場合には、ＬＥＤランプＸに流れる電流が該規定値になるように、調整用バイポーラトランジスタＱ１に並列の抵抗の合成抵抗値を小さくする（第１の調整抵抗Ｒ１と補助調整抵抗Ｒ１ａとの合成抵抗の抵抗値にする）ことができる（図３）。 As a result, for example, when lighting a high-beam LED lamp (three-stage LED element), the combined resistance of a resistor parallel to the adjustment bipolar transistor Q1 so that the current flowing through the LED lamp X becomes the specified value. The value can be reduced (the resistance value of the combined resistance of the first adjusting resistor R1 and the auxiliary adjusting resistor R1a) (FIG. 3).

このように、本実施例１の車両用ＬＥＤ点灯制御装置によれば、定電圧制御された電圧が供給されている場合に、直列に接続されたＬＥＤ素子のうち点灯させるＬＥＤ素子の段数を変化させても、ＬＥＤ電流を安定化させることができる。 As described above, according to the vehicle LED lighting control device of the first embodiment, when a constant voltage controlled voltage is supplied, the number of stages of the LED elements to be lit among the LED elements connected in series is changed. Even if it is made, the LED current can be stabilized.

既述の実施例１では、基準電圧生成回路Ｙが１つのダイオード又は直列に接続された複数のダイオードである場合について説明した。しかしながら、この基準電圧生成回路Ｙをバイポーラトランジスタで構成するようにしてもよい。 In the first embodiment described above, the case where the reference voltage generation circuit Y is one diode or a plurality of diodes connected in series has been described. However, the reference voltage generation circuit Y may be configured by a bipolar transistor.

ここで、図６は、実施例２に係る車両用ＬＥＤ点灯制御回路２００の構成の一例を示す図である。なお、図６において、図１の符号と同じ符号は、実施例１と同様の構成を示す。 Here, FIG. 6 is a diagram showing an example of the configuration of the vehicle LED lighting control circuit 200 according to the second embodiment. In FIG. 6, the same reference numerals as those in FIG. 1 indicate the same configuration as that of the first embodiment.

この図６の例では、実施例１と同様に、第１の電圧Ｖ１と第２の電圧Ｖ２との間の電位差が、定電圧制御（レギュレータ）により、予め規定された規定電圧に近づくように制御されているものとする。そして、第１の電圧Ｖ１と第２の電圧Ｖ２との電位差の範囲は、調整用バイポーラトランジスタＱ１が少なくとも不飽和領域で動作する範囲に設定されている。 In the example of FIG. 6, similarly to the first embodiment, the potential difference between the first voltage V1 and the second voltage V2 is adjusted to approach a predetermined specified voltage by the constant voltage control (regulator). It shall be controlled. The range of the potential difference between the first voltage V1 and the second voltage V2 is set to a range in which the adjusting bipolar transistor Q1 operates at least in an unsaturated region.

この実施例２に係る車両用ＬＥＤ点灯制御回路２００は、例えば、図６に示すように、第１の配線Ｈ１と、第２の配線Ｈ２と、第１の端子Ｔ１と、第２の端子Ｔ２と、ＬＥＤランプＸと、第１の調整抵抗Ｒ１と、第２の調整抵抗Ｒ２と、調整用バイポーラトランジスタＱ１と、制限抵抗ＲＳと、基準電圧生成回路Ｙと、補助調整抵抗Ｒ１ａと、スイッチ回路ＳＷと、第３の調整抵抗Ｒ３と、を備える。 In the vehicle LED lighting control circuit 200 according to the second embodiment, for example, as shown in FIG. 6, the first wiring H1, the second wiring H2, the first terminal T1, and the second terminal T2 , LED lamp X, first adjustment resistor R1, second adjustment resistor R2, adjustment bipolar transistor Q1, limiting resistor RS, reference voltage generation circuit Y, auxiliary adjustment resistor R1a, and switch circuit. It includes a SW and a third adjustment resistor R3.

すなわち、この実施例２に係る車両用ＬＥＤ点灯制御回路２００は、実施例１と比較して、第３の調整抵抗Ｒ３をさらに備えるとともに、基準電圧生成回路Ｙの構成が異なる。 That is, the vehicle LED lighting control circuit 200 according to the second embodiment further includes the third adjustment resistor R3 as compared with the first embodiment, and the configuration of the reference voltage generation circuit Y is different.

ここで、この第３の調整抵抗Ｒ３は、第２の調整抵抗Ｒ２の一端と第１の調整抵抗Ｒ３の他端との間に接続されている。なお、この第３の値要請抵抗Ｒ３は、省略されていてもよい。 Here, the third adjusting resistor R3 is connected between one end of the second adjusting resistor R2 and the other end of the first adjusting resistor R3. The third value request resistor R3 may be omitted.

そして、基準電圧生成回路Ｙは、実施例１と同様に、調整用バイポーラトランジスタＱ１の制御端子（ベース）と第２の調整抵抗Ｒ２の他端との間に基準電圧を印加する（すなわち、当該基準電圧の電位差を生成する）ようになっている。 Then, the reference voltage generation circuit Y applies a reference voltage between the control terminal (base) of the adjustment bipolar transistor Q1 and the other end of the second adjustment resistor R2 (that is, the reference voltage generation circuit Y), as in the first embodiment. It is designed to generate a potential difference of the reference voltage).

この基準電圧生成回路Ｙは、例えば、図６に示すように、一端（コレクタ）が調整用バイポーラトランジスタＱ１の制御端子（ベース）に接続され、他端（エミッタ）が第２の調整抵抗Ｒ２の他端に接続され、制御端子（ベース）が第２の調整抵抗Ｒ２の一端（第３の調整抵抗Ｒとの接続点）に接続された基準電圧用バイポーラトランジスタＱ２である。 In this reference voltage generation circuit Y, for example, as shown in FIG. 6, one end (collector) is connected to the control terminal (base) of the adjustment bipolar transistor Q1, and the other end (emitter) is the second adjustment resistor R2. A reference voltage bipolar transistor Q2 connected to the other end and having a control terminal (base) connected to one end (connection point with the third adjustment resistor R) of the second adjustment resistor R2.

特に、この基準電圧用バイポーラトランジスタＱ２は、コレクタが調整用バイポーラトランジスタＱ１のベースに接続され、エミッタが第２の調整抵抗Ｒ２の他端に接続され、ベースが第２の調整抵抗Ｒ２の一端（第３の調整抵抗Ｒとの接続点）に接続されたＮＰＮ型バイポーラトランジスタである。 In particular, in this reference voltage bipolar transistor Q2, the collector is connected to the base of the adjustment bipolar transistor Q1, the emitter is connected to the other end of the second adjustment resistor R2, and the base is one end of the second adjustment resistor R2 ( It is an NPN type bipolar transistor connected to the third adjustment resistor R).

ここで、上述のように、第１の電圧Ｖ１と第２の電圧Ｖ２との間の電位差が、定電圧制御（レギュレータ）により、予め規定された規定電圧に近づくように制御されている状態において、この基準電圧用バイポーラトランジスタＱ２は、調整用バイポーラトランジスタＱ１の制御端子（ベース）と第２の調整抵抗Ｒ２の他端との間に基準電圧を印加するようになっている。 Here, as described above, in a state where the potential difference between the first voltage V1 and the second voltage V2 is controlled by a constant voltage control (regulator) so as to approach a predetermined voltage. The reference voltage bipolar transistor Q2 applies a reference voltage between the control terminal (base) of the adjustment bipolar transistor Q1 and the other end of the second adjustment resistor R2.

なお、この実施例２に係る車両用ＬＥＤ点灯制御回路２００のその他の構成及び機能は、図１に示す実施例１の車両用ＬＥＤ点灯制御回路１００の構成及び機能と同様である。 The other configurations and functions of the vehicle LED lighting control circuit 200 according to the second embodiment are the same as the configurations and functions of the vehicle LED lighting control circuit 100 of the first embodiment shown in FIG.

すなわち、この実施例２に係る車両用ＬＥＤ点灯制御回路２００は、実施例１と同様に、簡易な構成にて、電源電圧に応じて、ＬＥＤランプＸに直列に接続される抵抗の抵抗値を制御することで、ＬＥＤランプＸのＬＥＤ電流が安定するように制御される。 That is, the vehicle LED lighting control circuit 200 according to the second embodiment has a simple configuration as in the first embodiment, and determines the resistance value of the resistor connected in series with the LED lamp X according to the power supply voltage. By controlling, the LED current of the LED lamp X is controlled to be stable.

特に、ユーザの操作により、スイッチ回路ＳＷが第１の状態に切り換えられることにより、第１のＬＥＤ素子Ｘ１を点灯し且つ第２のＬＥＤ素子Ｘ２のアノードとカソードとを同電位にして第２のＬＥＤ素子Ｘ２を消灯させるとともに、補助調整抵抗Ｒ１ａの他端と第１の調整抵抗Ｒ１の一端（切換ノードＴＳＷ）との間を遮断する。 In particular, when the switch circuit SW is switched to the first state by the user's operation, the first LED element X1 is turned on and the anode and cathode of the second LED element X2 are set to the same potential for the second. The LED element X2 is turned off, and the other end of the auxiliary adjustment resistor R1a and one end (switching node TSW) of the first adjustment resistor R1 are cut off.

これにより、例えば、ロービームのＬＥＤランプ（２段のＬＥＤ素子）を点灯させる場合には、ＬＥＤランプＸに流れる電流が規定値になるように、調整用バイポーラトランジスタＱ１に並列の抵抗の合成抵抗値を大きくする（第１の調整抵抗Ｒ１の抵抗値にする）ことができる。 As a result, for example, when lighting a low-beam LED lamp (two-stage LED element), the combined resistance value of the resistance parallel to the adjustment bipolar transistor Q1 so that the current flowing through the LED lamp X becomes a specified value. Can be increased (the resistance value of the first adjustment resistor R1 is set).

一方、既述のように、ユーザの操作により、このスイッチ回路ＳＷが第２の状態に切り換えられることにより、第１のＬＥＤ素子Ｘ１及び第２のＬＥＤ素子Ｘ２を点灯させるとともに、補助調整抵抗Ｒ１ａの他端と第１の調整抵抗Ｒ１の一端（切換ノードＴＳＷ）との間を導通させる。 On the other hand, as described above, the switch circuit SW is switched to the second state by the user's operation to light the first LED element X1 and the second LED element X2, and the auxiliary adjustment resistor R1a. Is made conductive between the other end of the above and one end (switching node TSW) of the first adjustment resistor R1.

これにより、例えば、ハイビームのＬＥＤランプ（３段のＬＥＤ素子）を点灯させる場合には、ＬＥＤランプＸに流れる電流が該規定値になるように、調整用バイポーラトランジスタＱ１に並列の抵抗の合成抵抗値を小さくする（第１の調整抵抗Ｒ１と補助調整抵抗Ｒ１ａとの合成抵抗の抵抗値にする）ことができる。 As a result, for example, when lighting a high-beam LED lamp (three-stage LED element), the combined resistance of a resistor parallel to the adjustment bipolar transistor Q1 so that the current flowing through the LED lamp X becomes the specified value. The value can be reduced (the resistance value of the combined resistance of the first adjusting resistor R1 and the auxiliary adjusting resistor R1a).

このように、実施例２の車両用ＬＥＤ点灯制御回路２００によれば、定電圧制御された電圧が供給されている場合に、直列に接続されたＬＥＤ素子のうち点灯させるＬＥＤ素子の段数を変化させても、ＬＥＤ電流を安定化させることができる。 As described above, according to the vehicle LED lighting control circuit 200 of the second embodiment, when a constant voltage controlled voltage is supplied, the number of stages of the LED elements to be lit among the LED elements connected in series is changed. Even if it is made, the LED current can be stabilized.

本実施例３では、既述の実施例１のＬＥＤランプ点灯制御回路と電源回路（レギュレータ）とを備えた車両用ＬＥＤ点灯制御装置の一例について説明する。 In the third embodiment, an example of the LED lighting control device for a vehicle including the LED lamp lighting control circuit and the power supply circuit (regulator) of the first embodiment described above will be described.

ここで、図７は、車両用ＬＥＤ点灯制御回路１００を適用した車両用ＬＥＤ点灯制御装置１０００の構成の一例を示す図である。なお、図７において、図１の符号と同じ符号は、実施例１と同様の構成を示す。 Here, FIG. 7 is a diagram showing an example of the configuration of the vehicle LED lighting control device 1000 to which the vehicle LED lighting control circuit 100 is applied. In FIG. 7, the same reference numerals as those in FIG. 1 indicate the same configuration as that of the first embodiment.

この実施例３に係る車両用ＬＥＤ点灯制御装置１０００は、既述の実施例と同様に、二輪車等の車両（図示せず）に積載されるＬＥＤランプＸの点灯を制御するようになっている。 The vehicle LED lighting control device 1000 according to the third embodiment controls the lighting of the LED lamp X loaded on a vehicle (not shown) such as a two-wheeled vehicle, as in the above-described embodiment. ..

この車両用ＬＥＤ点灯制御装置１０００は、例えば、図７に示すように、車両用ＬＥＤ点灯制御回路１００と、電源回路ＲＥＧと、を備える。 The vehicle LED lighting control device 1000 includes, for example, a vehicle LED lighting control circuit 100 and a power supply circuit REG, as shown in FIG. 7.

そして、電源回路ＲＥＧは、発電機Ｇが出力した交流電圧を直流電圧に変換して、第１の配線Ｈ１と第２の配線Ｈ２との間に所定の電源電圧（ここでは、負電圧）を供給するとともに当該電源電圧が一定になるように制御するようになっている。 Then, the power supply circuit REG converts the AC voltage output by the generator G into a DC voltage, and creates a predetermined power supply voltage (here, a negative voltage) between the first wiring H1 and the second wiring H2. It is controlled so that the power supply voltage becomes constant as well as being supplied.

この電源回路ＲＥＧは、例えば、図６に示すように、サイリスタＳと、キャパシタＣＸと、を備える。 This power supply circuit REG includes, for example, a thyristor S and a capacitor CX, as shown in FIG.

そして、サイリスタＳは、アノードが第２の端子Ｔ２（第２の配線Ｈ２）に接続され、カソードが発電機ＧのコイルＧＬの一端に接続されている。 The anode of the thyristor S is connected to the second terminal T2 (second wiring H2), and the cathode is connected to one end of the coil GL of the generator G.

また、キャパシタＣＸは、一端が第２の端子Ｔ２（第２の配線Ｈ２）に接続され、他端が第１の端子Ｔ１（第１の配線Ｈ１）に接続されている。 Further, one end of the capacitor CX is connected to the second terminal T2 (second wiring H2), and the other end is connected to the first terminal T1 (first wiring H1).

ここで、発電機Ｇは、一端がサイリスタＳのカソードに接続され、他端が第１の端子Ｔ１（第１の配線Ｈ１）に接続されたコイルＧＬを、有する。 Here, the generator G has a coil GL having one end connected to the cathode of the thyristor S and the other end connected to the first terminal T1 (first wiring H1).

この発電機Ｇは、キャパシタＣＸを充電してＬＥＤランプＰを点灯するための交流電圧を発生し、コイルＧＬの両端から出力するようになっている。 The generator G charges the capacitor CX to generate an AC voltage for lighting the LED lamp P, and outputs the AC voltage from both ends of the coil GL.

この発電機Ｇは、例えば、二輪車等の車両のエンジンにより直結駆動されるオルタネータである。 The generator G is, for example, an alternator that is directly connected and driven by the engine of a vehicle such as a two-wheeled vehicle.

そして、電源回路ＲＥＧは、キャパシタＣＸの充電電圧が一定の電源電圧になるように、サイリスタＳのオン／オフを制御するようになっている。 The power supply circuit REG controls the on / off of the thyristor S so that the charging voltage of the capacitor CX becomes a constant power supply voltage.

なお、本実施例３では、この第１の端子Ｔ１（第１の配線Ｈ１）の電位（接地電位）は、０Ｖに限定されるものではなく、少なくともＬＥＤランプＸを点灯可能なような固定の電位に設定される。 In the third embodiment, the potential (ground potential) of the first terminal T1 (first wiring H1) is not limited to 0V, and is fixed so that at least the LED lamp X can be lit. Set to potential.

ここで、図７に示すように、本実施例７に係る車両用ＬＥＤ点灯制御装置１０００は、発電機Ｇで発電した交流電圧を用いて、二輪車等の車両（図示せず）に積載されるＬＥＤランプＸの点灯を制御するようになっている。この車両用ＬＥＤ点灯制御装置１０００は、例えば、当該車両（二輪車）に積載される。 Here, as shown in FIG. 7, the vehicle LED lighting control device 1000 according to the seventh embodiment is loaded on a vehicle (not shown) such as a two-wheeled vehicle by using the AC voltage generated by the generator G. The lighting of the LED lamp X is controlled. The vehicle LED lighting control device 1000 is loaded on the vehicle (motorcycle), for example.

特に、図７に示すように、車両用ＬＥＤ点灯制御装置１０００は、出力する交流電流を整流してＬＥＤランプＸに電流を供給して当該ＬＥＤランプＸの点灯を制御するようになっている。 In particular, as shown in FIG. 7, the vehicle LED lighting control device 1000 rectifies the output alternating current and supplies the current to the LED lamp X to control the lighting of the LED lamp X.

ここで、例えば、発電機Ｇの出力電圧が変動しても、電源回路ＲＥＧは、電源電圧が一定になるように、サイリスタＳを制御するが、キャパシタＣＸの充電電圧も或る範囲で変動することとなる。すなわち、電源回路ＲＥＧが出力する電源電圧が或る範囲で変動する。 Here, for example, even if the output voltage of the generator G fluctuates, the power supply circuit REG controls the thyristor S so that the power supply voltage becomes constant, but the charging voltage of the capacitor CX also fluctuates within a certain range. It will be. That is, the power supply voltage output by the power supply circuit REG fluctuates within a certain range.

このように電源電圧が変動している場合であっても、車両用ＬＥＤ点灯制御回路１００は、第２の調整抵抗Ｒ２の電圧降下が第１の範囲にある場合（すなわち、電源電圧が低い、又はＬＥＤランプＸのＶＦ電圧が大きい場合）には、調整用バイポーラトランジスタＱ１がオンして、ＬＥＤランプＸに流れるＬＥＤ電流が第１の調整抵抗Ｒ１を迂回するように制御する。 Even when the power supply voltage fluctuates in this way, the vehicle LED lighting control circuit 100 has a case where the voltage drop of the second adjustment resistor R2 is in the first range (that is, the power supply voltage is low). Or when the VF voltage of the LED lamp X is large), the adjustment bipolar transistor Q1 is turned on, and the LED current flowing through the LED lamp X is controlled to bypass the first adjustment resistor R1.

そして、車両用ＬＥＤ点灯制御回路１００は、第２の調整抵抗Ｒ２の電圧降下が第１の範囲よりも高い第２の範囲にある場合に、調整用バイポーラトランジスタＱ１が不飽和領域で動作してＬＥＤランプＸに流れるＬＥＤ電流の値を目標値（一定）に制御する。 Then, in the vehicle LED lighting control circuit 100, when the voltage drop of the second adjusting resistor R2 is in the second range higher than the first range, the adjusting bipolar transistor Q1 operates in the unsaturated region. The value of the LED current flowing through the LED lamp X is controlled to a target value (constant).

そして、車両用ＬＥＤ点灯制御回路１００は、第２の調整抵抗の電圧降下が第２の範囲よりも高い第３の範囲にある場合（すなわち、電源電圧が高い、又はＶＦ電圧が小さい場合）に、調整用バイポーラトランジスタＱ１がオフして、ＬＥＤランプＸに流れるＬＥＤ電流が第１の調整抵抗Ｒ１を流れるように制御する。 Then, the vehicle LED lighting control circuit 100 is used when the voltage drop of the second adjustment resistor is in the third range higher than the second range (that is, when the power supply voltage is high or the VF voltage is low). The adjustment bipolar transistor Q1 is turned off, and the LED current flowing through the LED lamp X is controlled to flow through the first adjustment resistor R1.

これにより、簡易な構成にて、電源電圧に応じて、ＬＥＤランプＸに直列に接続される抵抗の抵抗値を制御することで、ＬＥＤランプＸのＬＥＤ電流が安定するように制御されることとなる。 As a result, in a simple configuration, the LED current of the LED lamp X is controlled to be stable by controlling the resistance value of the resistor connected in series with the LED lamp X according to the power supply voltage. Become.

このように、車両用ＬＥＤ点灯制御装置１０００によれば、電源電圧が変化した場合に、ＬＥＤ電流を安定させることができる。 As described above, according to the vehicle LED lighting control device 1000, the LED current can be stabilized when the power supply voltage changes.

特に、ユーザの操作により、スイッチ回路ＳＷが第１の状態に切り換えられることにより、第１のＬＥＤ素子Ｘ１を点灯し且つ第２のＬＥＤ素子Ｘ２のアノードとカソードとを同電位にして第２のＬＥＤ素子Ｘ２を消灯させるとともに、補助調整抵抗Ｒ１ａの他端と第１の調整抵抗Ｒ１の一端（切換ノードＴＳＷ）との間を遮断する。 In particular, when the switch circuit SW is switched to the first state by the user's operation, the first LED element X1 is turned on and the anode and cathode of the second LED element X2 are set to the same potential for the second. The LED element X2 is turned off, and the other end of the auxiliary adjustment resistor R1a and one end (switching node TSW) of the first adjustment resistor R1 are cut off.

これにより、例えば、ロービームのＬＥＤランプ（２段のＬＥＤ素子）を点灯させる場合には、ＬＥＤランプＸに流れる電流が規定値になるように、調整用バイポーラトランジスタＱ１に並列の抵抗の合成抵抗値を大きくする（第１の調整抵抗Ｒ１の抵抗値にする）ことができる。 As a result, for example, when lighting a low-beam LED lamp (two-stage LED element), the combined resistance value of the resistance parallel to the adjustment bipolar transistor Q1 so that the current flowing through the LED lamp X becomes a specified value. Can be increased (the resistance value of the first adjustment resistor R1 is set).

一方、既述のように、ユーザの操作により、このスイッチ回路ＳＷが第２の状態に切り換えられることにより、第１のＬＥＤ素子Ｘ１及び第２のＬＥＤ素子Ｘ２を点灯させるとともに、補助調整抵抗Ｒ１ａの他端と第１の調整抵抗Ｒ１の一端（切換ノードＴＳＷ）との間を導通させる。 On the other hand, as described above, the switch circuit SW is switched to the second state by the user's operation to light the first LED element X1 and the second LED element X2, and the auxiliary adjustment resistor R1a. Is made conductive between the other end of the above and one end (switching node TSW) of the first adjustment resistor R1.

これにより、例えば、ハイビームのＬＥＤランプ（３段のＬＥＤ素子）を点灯させる場合には、ＬＥＤランプＸに流れる電流が該規定値になるように、調整用バイポーラトランジスタＱ１に並列の抵抗の合成抵抗値を小さくする（第１の調整抵抗Ｒ１と補助調整抵抗Ｒ１ａとの合成抵抗の抵抗値にする）ことができる。 As a result, for example, when lighting a high-beam LED lamp (three-stage LED element), the combined resistance of a resistor parallel to the adjustment bipolar transistor Q1 so that the current flowing through the LED lamp X becomes the specified value. The value can be reduced (the resistance value of the combined resistance of the first adjusting resistor R1 and the auxiliary adjusting resistor R1a).

このように、車両用ＬＥＤ点灯制御装置１０００によれば、実施例１と同様に、定電圧制御された電圧が供給されている場合に、直列に接続されたＬＥＤ素子のうち点灯させるＬＥＤ素子の段数を変化させても、ＬＥＤ電流を安定化させることができる。 As described above, according to the vehicle LED lighting control device 1000, as in the first embodiment, when the constant voltage controlled voltage is supplied, the LED element to be turned on among the LED elements connected in series The LED current can be stabilized even if the number of stages is changed.

なお、本実施例では、電源回路ＲＥＧと車両用ＬＥＤ点灯制御回路１００を組み合わせた場合について説明したが、この車両用ＬＥＤ点灯制御回路１００に代えて、図６に示す実施例２に係る車両用ＬＥＤ点灯制御回路２００を、車両用ＬＥＤ点灯制御装置１０００に適用されるようにしてもよい。 In this embodiment, the case where the power supply circuit REG and the LED lighting control circuit 100 for a vehicle are combined has been described, but instead of the LED lighting control circuit 100 for a vehicle, for a vehicle according to the second embodiment shown in FIG. The LED lighting control circuit 200 may be applied to the vehicle LED lighting control device 1000.

以上のように、本発明の一態様に係る車両用ＬＥＤ点灯制御回路は、定電圧制御された電圧によりＬＥＤランプの点灯を制御する車両用ＬＥＤ点灯制御回路であって、第１の電圧が供給される第１の配線Ｈ１（例えば、接地電圧）と、第１の電圧よりも低い第２の電圧（例えば、負電圧）が供給される第２の配線Ｈ２と、アノードが第１の配線に接続され且つカソードが中間ノードＴＸに接続された第１のＬＥＤ素子Ｘ１と、アノードが中間ノードＴＸに接続され且つカソードが切換ノードＴＳＷに接続された第２のＬＥＤ素子Ｘ２とを含むＬＥＤランプＸと、一端が切換ノードＴＳＷに接続された第１の調整抵抗Ｒ１と、一端が第１の調整抵抗の他端に接続され、他端が第２の配線に接続された第２の調整抵抗Ｒ２と、一端（コレクタ）が第１の調整抵抗の一端に接続され、他端（エミッタ）が第１の調整抵抗の他端に接続された調整用バイポーラトランジスタＱ１と、一端がＬＥＤランプの第１のＬＥＤ素子のアノードに接続され、他端が調整用バイポーラトランジスタの制御端子（ベース）に接続された制限抵抗Ｓと、一端が調整用バイポーラトランジスタの制御端子に接続され、他端が第２の調整抵抗の他端に接続され、調整用バイポーラトランジスタの制御端子と第２の調整抵抗の他端との間に基準電圧を印加する基準電圧生成回路Ｙと、一端が第１の調整抵抗Ｒ１の他端に接続された補助調整抵抗Ｒ１ａと、切換ノードＴＳＷと、中間ノードＴＸに接続された第１の接点Ｌｏとの間が導通した第１の状態と、切換ノードＴＳＷと、補助調整抵抗Ｒ１ａの他端に接続された第２の接点Ｈｉとの間が導通した第２の状態とを切り換えるスイッチ回路ＳＷと、を備える。 As described above, the vehicle LED lighting control circuit according to one aspect of the present invention is a vehicle LED lighting control circuit that controls the lighting of the LED lamp by a constant voltage controlled voltage, and the first voltage is supplied. A first wiring H1 (for example, a ground voltage) to be supplied, a second wiring H2 to which a second voltage (for example, a negative voltage) lower than the first voltage is supplied, and an anode to the first wiring. An LED lamp X including a first LED element X1 connected and having a cathode connected to an intermediate node TX and a second LED element X2 having an anode connected to an intermediate node TX and a cathode connected to a switching node TSW. A first adjustment resistor R1 having one end connected to the switching node TSW, and a second adjustment resistor R2 having one end connected to the other end of the first adjustment resistor and the other end connected to the second wiring. The adjustment bipolar transistor Q1 in which one end (collector) is connected to one end of the first adjustment resistor and the other end (emitter) is connected to the other end of the first adjustment resistor, and one end is the first LED lamp. The limiting resistor S, which is connected to the anode of the LED element of the above and the other end is connected to the control terminal (base) of the adjustment bipolar transistor, and one end is connected to the control terminal of the adjustment bipolar transistor, and the other end is the second. A reference voltage generation circuit Y connected to the other end of the adjustment resistor and applying a reference voltage between the control terminal of the adjustment bipolar transistor and the other end of the second adjustment resistor, and one end of the first adjustment resistor R1. The first state in which the auxiliary adjustment resistor R1a connected to the other end, the switching node TSW, and the first contact Lo connected to the intermediate node TX are electrically connected, the switching node TSW, and the auxiliary adjustment resistor R1a. The switch circuit SW for switching between the second contact Hi connected to the other end of the second contact Hi and the second contact Hi is provided.

例えば、ロービームのＬＥＤランプ（２段のＬＥＤ素子）を点灯させる場合には、流れる電流が規定値になるように、調整用バイポーラトランジスタＱ１に並列の抵抗Ｒ１，Ｒ１ａの合成抵抗値を大きくする（図２）。 For example, when lighting a low-beam LED lamp (two-stage LED element), the combined resistance value of the resistors R1 and R1a parallel to the adjustment bipolar transistor Q1 is increased so that the flowing current becomes a specified value (. Figure 2).

一方、ハイビームのＬＥＤランプ（３段のＬＥＤ素子）を点灯させる場合には、流れる電流が該規定値になるように、調整用バイポーラトランジスタＱ１に並列の抵抗Ｒ１、Ｒ１ｂの合成抵抗値を小さくする（図３）。 On the other hand, when lighting a high beam LED lamp (three-stage LED element), the combined resistance value of the resistors R1 and R1b parallel to the adjustment bipolar transistor Q1 is reduced so that the flowing current becomes the specified value. (Fig. 3).

このように、本発明の車両用ＬＥＤ点灯制御装置によれば、定電圧制御された電圧が供給されている場合に、直列に接続されたＬＥＤ素子のうち点灯させるＬＥＤ素子の段数を変化させても、ＬＥＤ電流を安定化させることができる。 As described above, according to the vehicle LED lighting control device of the present invention, when a constant voltage controlled voltage is supplied, the number of stages of the LED elements to be lit among the LED elements connected in series is changed. Also, the LED current can be stabilized.

本発明のいくつかの実施形態を説明したが、これらの実施形態は、例として提示したものであり、発明の範囲を限定することは意図していない。これら実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、置き換え、変更を行うことができる。これら実施形態やその変形は、発明の範囲や要旨に含まれると同様に、特許請求の範囲に記載された発明とその均等の範囲に含まれるものである。 Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, as well as in the scope of the invention described in the claims and the equivalent scope thereof.

１０００ 車両用ＬＥＤ点灯制御装置
１００ 車両用ＬＥＤ点灯制御回路
Ｈ１ 第１の配線
Ｈ２ 第２の配線
Ｔ１ 第１の端子
Ｔ２ 第２の端子
Ｘ ＬＥＤランプ
Ｒ１ 第１の調整抵抗
Ｒ２ 第２の調整抵抗
Ｑ１ 調整用バイポーラトランジスタ
ＲＳ 制限抵抗
Ｙ 基準電圧生成回路
ＳＷ スイッチ回路1000 Vehicle LED lighting control device 100 Vehicle LED lighting control circuit H1 First wiring H2 Second wiring T1 First terminal T2 Second terminal X LED lamp R1 First adjustment resistor R2 Second adjustment resistor Q1 Bipolar transistor for adjustment RS Limiting resistor Y Reference voltage generation circuit SW switch circuit

Claims (15)

定電圧制御された電圧によりＬＥＤランプの点灯を制御する車両用ＬＥＤ点灯制御回路であって、
第１の電圧が供給される第１の配線と、
前記第１の電圧よりも低い第２の電圧が供給される第２の配線と、
アノードが前記第１の配線に接続され且つカソードが中間ノードに接続された第１のＬＥＤ素子と、アノードが前記中間ノードに接続され且つカソードが切換ノードに接続された第２のＬＥＤ素子とを含むＬＥＤランプと、
一端が前記切換ノードに接続された第１の調整抵抗と、
一端が前記第１の調整抵抗の他端に接続され、他端が前記第２の配線に接続された第２の調整抵抗と、
一端が前記第１の調整抵抗の前記一端に接続され、他端が前記第１の調整抵抗の前記他端に接続された調整用バイポーラトランジスタと、
一端が前記ＬＥＤランプの前記第１のＬＥＤ素子の前記アノードに接続され、他端が前記調整用バイポーラトランジスタの制御端子に接続された制限抵抗と、
一端が前記調整用バイポーラトランジスタの前記制御端子に接続され、他端が前記第２の調整抵抗の前記他端に接続され、前記調整用バイポーラトランジスタの前記制御端子と前記第２の調整抵抗の他端との間に基準電圧を印加する基準電圧生成回路と、
一端が前記第１の調整抵抗の他端に接続された補助調整抵抗と、
前記切換ノードと、前記中間ノードに接続された第１の接点との間が導通した第１の状態と、前記切換ノードと、前記補助調整抵抗の他端に接続された第２の接点との間が導通した第２の状態とを切り換えるスイッチ回路ＳＷと、を備える
ことを特徴とする車両用ＬＥＤ点灯制御回路。It is an LED lighting control circuit for vehicles that controls the lighting of LED lamps by a constant voltage controlled voltage.
The first wiring to which the first voltage is supplied and
A second wiring to which a second voltage lower than the first voltage is supplied, and
A first LED element in which the anode is connected to the first wiring and the cathode is connected to the intermediate node, and a second LED element in which the anode is connected to the intermediate node and the cathode is connected to the switching node. Including LED lamp and
A first adjustment resistor with one end connected to the switching node,
A second adjustment resistor having one end connected to the other end of the first adjustment resistor and the other end connected to the second wiring.
An adjustment bipolar transistor having one end connected to the other end of the first adjustment resistor and the other end connected to the other end of the first adjustment resistor.
A limiting resistor having one end connected to the anode of the first LED element of the LED lamp and the other end connected to the control terminal of the adjusting bipolar transistor.
One end is connected to the control terminal of the adjustment bipolar transistor, the other end is connected to the other end of the second adjustment resistor, and the control terminal of the adjustment bipolar transistor and the other of the second adjustment resistor are connected. A reference voltage generation circuit that applies a reference voltage between the ends and
Auxiliary adjustment resistor with one end connected to the other end of the first adjustment resistor,
A first state in which the switching node and the first contact connected to the intermediate node are electrically connected, and the switching node and the second contact connected to the other end of the auxiliary adjustment resistor. A vehicle LED lighting control circuit including a switch circuit SW for switching between a second state in which the nodes are electrically connected. 前記基準電圧生成回路は、
アノード側が前記調整用バイポーラトランジスタの前記制御端子に接続され且つカソード側が前記第２の調整抵抗の他端に接続された、１つのダイオード又は直列に接続された複数のダイオードである
ことを特徴とする請求項１に記載の車両用ＬＥＤ点灯制御回路。The reference voltage generation circuit is
The anode side is connected to the control terminal of the adjusting bipolar transistor, and the cathode side is connected to the other end of the second adjusting resistor, which is one diode or a plurality of diodes connected in series. The vehicle LED lighting control circuit according to claim 1. 前記基準電圧生成回路は、一端が前記調整用バイポーラトランジスタの前記制御端子に接続され、他端が前記第２の調整抵抗の前記他端に接続され、制御端子が前記第２の調整抵抗の前記一端に接続された基準電圧用バイポーラトランジスタである
ことを特徴とする請求項１に記載の車両用ＬＥＤ点灯制御回路。One end of the reference voltage generation circuit is connected to the control terminal of the adjustment bipolar transistor, the other end is connected to the other end of the second adjustment resistor, and the control terminal is the control terminal of the second adjustment resistor. The vehicle LED lighting control circuit according to claim 1, wherein the reference voltage bipolar transistor is connected to one end. 前記第２の調整抵抗の前記一端と前記第１の調整抵抗の前記他端との間に接続された第３の調整抵抗をさらに備える
ことを特徴とする請求項３に記載の車両用ＬＥＤ点灯制御回路。The vehicle LED lighting according to claim 3, further comprising a third adjustment resistor connected between the one end of the second adjustment resistor and the other end of the first adjustment resistor. Control circuit. 前記第１の電圧と前記第２の電圧との間の電位差が少なくとも前記ＬＥＤランプが点灯する大きさである状態において、
前記第２の調整抵抗の電圧降下が第１の範囲にある場合には、前記調整用バイポーラトランジスタがオンして、前記ＬＥＤランプに流れるＬＥＤ電流が前記第１の調整抵抗を迂回するように制御し、
前記第２の調整抵抗の電圧降下が第１の範囲よりも高い第２の範囲にある場合に、前記調整用バイポーラトランジスタが不飽和領域で動作して前記ＬＥＤランプに流れる前記ＬＥＤ電流の値を目標値に制御し、
前記第２の調整抵抗の電圧降下が前記第２の範囲よりも高い第３の範囲にある場合に、前記調整用バイポーラトランジスタがオフして、前記ＬＥＤランプに流れる前記ＬＥＤ電流が前記第１の調整抵抗を流れるように制御する
ことを特徴とする請求項２又は３に記載の車両用ＬＥＤ点灯制御回路。In a state where the potential difference between the first voltage and the second voltage is at least large enough to light the LED lamp.
When the voltage drop of the second adjustment resistor is in the first range, the adjustment bipolar transistor is turned on and the LED current flowing through the LED lamp is controlled to bypass the first adjustment resistor. And
When the voltage drop of the second adjusting resistor is in the second range higher than the first range, the value of the LED current flowing through the LED lamp by operating the adjusting bipolar transistor in the unsaturated region is determined. Control to the target value,
When the voltage drop of the second adjusting resistor is in the third range higher than the second range, the adjusting bipolar transistor is turned off and the LED current flowing through the LED lamp is the first. The vehicle LED lighting control circuit according to claim 2 or 3, wherein the adjustment resistor is controlled to flow. 前記第１の電圧と前記第２の電圧との間の電位差が定電圧制御により、予め規定された規定電圧に近づくように制御されている
ことを特徴とする請求項５に記載の車両用ＬＥＤ点灯制御回路。The vehicle LED according to claim 5, wherein the potential difference between the first voltage and the second voltage is controlled by constant voltage control so as to approach a predetermined voltage. Lighting control circuit. 前記スイッチ回路が前記第１の状態に切り換えられることにより、前記第１のＬＥＤ素子を点灯し且つ前記第２のＬＥＤ素子の前記アノードと前記カソードとを同電位にして前記第２のＬＥＤ素子を消灯させるとともに、前記補助調整抵抗の他端と前記第１の調整抵抗の前記一端との間を遮断し、
一方、前記スイッチ回路ＳＷが前記第２の状態に切り換えられることにより、前記第１のＬＥＤ素子及び前記第２のＬＥＤ素子を点灯させるとともに、前記補助調整抵抗の前記他端と第１の調整抵抗の前記一端との間を導通させる
ことを特徴とする請求項６に記載の車両用ＬＥＤ点灯制御回路。When the switch circuit is switched to the first state, the first LED element is turned on and the anode and the cathode of the second LED element are set to the same potential to cause the second LED element to be turned on. While turning off the light, the other end of the auxiliary adjustment resistor and the one end of the first adjustment resistor are cut off.
On the other hand, when the switch circuit SW is switched to the second state, the first LED element and the second LED element are turned on, and the other end of the auxiliary adjustment resistor and the first adjustment resistor are turned on. The LED lighting control circuit for a vehicle according to claim 6, wherein the LED lighting control circuit for a vehicle is made conductive with one end of the above. 前記第１の電圧と前記第２の電圧との電位差の範囲は、前記調整用バイポーラトランジスタが少なくとも不飽和領域で動作する範囲に設定されている
ことを特徴とする請求項６に記載の車両用ＬＥＤ点灯制御回路。The vehicle use according to claim 6, wherein the range of the potential difference between the first voltage and the second voltage is set to a range in which the adjusting bipolar transistor operates at least in an unsaturated region. LED lighting control circuit. 前記車両用ＬＥＤ点灯制御回路は、二輪車に積載され、
前記ＬＥＤランプは、前記二輪車のヘッドライト、ウインカー、テールランプ、ポジションランプ、又は、メータイルミネーションの何れかである
ことを特徴とする請求項７に記載の車両用ＬＥＤ点灯制御回路。The LED lighting control circuit for a vehicle is loaded on a two-wheeled vehicle.
The vehicle LED lighting control circuit according to claim 7, wherein the LED lamp is any one of a headlight, a blinker, a tail lamp, a position lamp, and a meter illumination of the two-wheeled vehicle. 前記補助調整抵抗の抵抗値は、前記第１の調整抵抗の抵抗値よりも、小さくなるように設定されていることを特徴とする請求項１に記載の車両用ＬＥＤ点灯制御回路。 The LED lighting control circuit for a vehicle according to claim 1, wherein the resistance value of the auxiliary adjustment resistor is set to be smaller than the resistance value of the first adjustment resistor. 前記第１のＬＥＤ素子のみが点灯することにより、前記二輪車のヘッドライトのロービームの点灯を構成し、
前記第１のＬＥＤ素子及び前記第２のＬＥＤ素子が点灯することにより、前記二輪車のヘッドライトのハイビームの点灯を構成する
ことを特徴とする請求項９に記載の車両用ＬＥＤ点灯制御回路。By lighting only the first LED element, the low beam of the headlight of the motorcycle is lit.
The LED lighting control circuit for a vehicle according to claim 9, wherein the high beam of the headlight of the two-wheeled vehicle is lit by lighting the first LED element and the second LED element. 前記基準電圧用バイポーラトランジスタは、
コレクタが前記調整用バイポーラトランジスタの前記制御端子に接続され、エミッタが前記第２の調整抵抗の前記他端に接続され、制御端子が前記第２の調整抵抗の前記一端に接続されたＮＰＮ型バイポーラトランジスタである
ことを特徴とする請求項３に記載の車両用ＬＥＤ点灯制御回路。The reference voltage bipolar transistor is
An NPN-type bipolar in which a collector is connected to the control terminal of the adjustment bipolar transistor, an emitter is connected to the other end of the second adjustment resistor, and a control terminal is connected to the end of the second adjustment resistor. The vehicle LED lighting control circuit according to claim 3, further comprising a transistor. 前記スイッチ回路は、
前記ＬＥＤランプの点灯を制御するために、ユーザにより操作されるようになっていることを特徴とする請求項７に記載の車両用ＬＥＤ点灯制御回路。The switch circuit
The LED lighting control circuit for a vehicle according to claim 7, wherein the LED lamp is operated by a user in order to control the lighting of the LED lamp. 定電圧制御された電圧によりＬＥＤランプの点灯を制御する車両用ＬＥＤ点灯制御回路と、
発電機が出力した交流電圧を直流電圧に変換して、第１の配線と第２の配線との間に電源電圧を供給する電源回路と、を備え、
前記車両用ＬＥＤ点灯制御回路は、
第１の電圧が供給される前記第１の配線と、
前記第１の電圧よりも低い第２の電圧が供給される前記第２の配線と、
アノードが前記第１の配線に接続され且つカソードが中間ノードに接続された第１のＬＥＤ素子と、アノードが前記中間ノードに接続され且つカソードが切換ノードに接続された第２のＬＥＤ素子とを含むＬＥＤランプと、
一端が前記切換ノードに接続された第１の調整抵抗と、
一端が前記第１の調整抵抗の他端に接続され、他端が前記第２の配線に接続された第２の調整抵抗と、
一端が前記第１の調整抵抗の前記一端に接続され、他端が前記第１の調整抵抗の前記他端に接続された調整用バイポーラトランジスタと、
一端が前記ＬＥＤランプの前記第１のＬＥＤ素子の前記アノードに接続され、他端が前記調整用バイポーラトランジスタの制御端子に接続された制限抵抗と、
一端が前記調整用バイポーラトランジスタの前記制御端子に接続され、他端が前記第２の調整抵抗の前記他端に接続され、前記調整用バイポーラトランジスタの前記制御端子と前記第２の調整抵抗の他端との間に基準電圧を印加する基準電圧生成回路と、
一端が前記第１の調整抵抗の他端に接続された補助調整抵抗と、
前記切換ノードと、前記中間ノードに接続された第１の接点との間が導通した第１の状態と、前記切換ノードと、前記補助調整抵抗の他端に接続された第２の接点との間が導通した第２の状態とを切り換えるスイッチ回路と、を備える
ることを特徴とする車両用ＬＥＤ点灯制御装置。A vehicle LED lighting control circuit that controls the lighting of LED lamps by a constant voltage controlled voltage,
It is equipped with a power supply circuit that converts the AC voltage output by the generator into a DC voltage and supplies the power supply voltage between the first wiring and the second wiring.
The vehicle LED lighting control circuit is
With the first wiring to which the first voltage is supplied,
With the second wiring to which a second voltage lower than the first voltage is supplied,
A first LED element in which the anode is connected to the first wiring and the cathode is connected to the intermediate node, and a second LED element in which the anode is connected to the intermediate node and the cathode is connected to the switching node. Including LED lamp and
A first adjustment resistor with one end connected to the switching node,
A second adjustment resistor having one end connected to the other end of the first adjustment resistor and the other end connected to the second wiring.
An adjustment bipolar transistor having one end connected to the other end of the first adjustment resistor and the other end connected to the other end of the first adjustment resistor.
A limiting resistor having one end connected to the anode of the first LED element of the LED lamp and the other end connected to the control terminal of the adjusting bipolar transistor.
One end is connected to the control terminal of the adjustment bipolar transistor, the other end is connected to the other end of the second adjustment resistor, and the control terminal of the adjustment bipolar transistor and the other of the second adjustment resistor are connected. A reference voltage generation circuit that applies a reference voltage between the ends and
Auxiliary adjustment resistor with one end connected to the other end of the first adjustment resistor,
A first state in which the switching node and the first contact connected to the intermediate node are electrically connected, and the switching node and the second contact connected to the other end of the auxiliary adjustment resistor. A vehicle LED lighting control device including a switch circuit for switching between a second state in which the nodes are electrically connected. 定電圧制御された電圧によりＬＥＤランプの点灯を制御する車両用ＬＥＤ点灯制御回路であって、第１の電圧が供給される第１の配線と、前記第１の電圧よりも低い第２の電圧が供給される第２の配線と、アノードが前記第１の配線に接続され且つカソードが中間ノードに接続された第１のＬＥＤ素子と、アノードが前記中間ノードに接続され且つカソードが切換ノードに接続された第２のＬＥＤ素子とを含むＬＥＤランプと、一端が前記切換ノードに接続された第１の調整抵抗と、一端が前記第１の調整抵抗の他端に接続され、他端が前記第２の配線に接続された第２の調整抵抗と、一端が前記第１の調整抵抗の前記一端に接続され、他端が前記第１の調整抵抗の前記他端に接続された調整用バイポーラトランジスタと、一端が前記ＬＥＤランプの前記第１のＬＥＤ素子の前記アノードに接続され、他端が前記調整用バイポーラトランジスタの制御端子に接続された制限抵抗と、一端が前記調整用バイポーラトランジスタの前記制御端子に接続され、他端が前記第２の調整抵抗の前記他端に接続され、前記調整用バイポーラトランジスタの前記制御端子と前記第２の調整抵抗の他端との間に基準電圧を印加する基準電圧生成回路と、一端が前記第１の調整抵抗の他端に接続された補助調整抵抗と、前記切換ノードと、前記中間ノードに接続された第１の接点との間が導通した第１の状態と、前記切換ノードと、前記補助調整抵抗の他端に接続された第２の接点との間が導通した第２の状態とを切り換えるスイッチ回路ＳＷと、を備える車両用ＬＥＤ点灯制御回路の制御方法であって、
前記スイッチ回路が前記第１の状態に切り換えられることにより、前記第１のＬＥＤ素子を点灯し且つ前記第２のＬＥＤ素子の前記アノードと前記カソードとを同電位にして前記第２のＬＥＤ素子を消灯させるとともに、前記補助調整抵抗の他端と前記第１の調整抵抗の前記一端との間を遮断し、
一方、前記スイッチ回路ＳＷが前記第２の状態に切り換えられることにより、前記第１のＬＥＤ素子及び前記第２のＬＥＤ素子を点灯させるとともに、前記補助調整抵抗の他端と第１の調整抵抗の前記一端との間を導通させる
ことを特徴とする車両用ＬＥＤ点灯制御回路の制御方法。A vehicle LED lighting control circuit that controls the lighting of an LED lamp by a constant voltage controlled voltage, a first wiring to which a first voltage is supplied, and a second voltage lower than the first voltage. The second wiring to which the voltage is supplied, the first LED element in which the anode is connected to the first wiring and the cathode is connected to the intermediate node, and the anode is connected to the intermediate node and the cathode is connected to the switching node. An LED lamp including a second LED element connected, a first adjustment resistor having one end connected to the switching node, and one end connected to the other end of the first adjustment resistor, the other end of which is said. A second adjustment resistor connected to the second wiring and an adjustment bipolar having one end connected to the one end of the first adjustment resistor and the other end connected to the other end of the first adjustment resistor. The transistor, a limiting resistor having one end connected to the anode of the first LED element of the LED lamp and the other end connected to the control terminal of the adjusting bipolar transistor, and one end of the adjusting bipolar transistor. It is connected to the control terminal, the other end is connected to the other end of the second adjustment resistor, and a reference voltage is applied between the control terminal of the adjustment bipolar transistor and the other end of the second adjustment resistor. The reference voltage generation circuit to be used, the auxiliary adjustment resistor whose one end is connected to the other end of the first adjustment resistor, the switching node, and the first contact connected to the intermediate node are conductive. LED lighting control for vehicles including a switch circuit SW for switching between the state 1 and the second state in which the switching node and the second contact connected to the other end of the auxiliary adjustment resistor are electrically connected. It ’s a circuit control method.
When the switch circuit is switched to the first state, the first LED element is turned on and the anode and the cathode of the second LED element are set to the same potential to cause the second LED element to be turned on. While turning off the light, the other end of the auxiliary adjustment resistor and the one end of the first adjustment resistor are cut off.
On the other hand, when the switch circuit SW is switched to the second state, the first LED element and the second LED element are turned on, and the other end of the auxiliary adjustment resistor and the first adjustment resistor are connected. A method for controlling an LED lighting control circuit for a vehicle, which comprises conducting conduction with one end.
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